A child plays on an escalator by going up and down while the escalator is moving. When he runs upward in the same direction with the escalator he can reach the upper level in 27 seconds. Then he runs downward in the opposite direction of the escalator, and he reaches the lower level in 79 seconds. The child has the same average speed relative to the escalator in both cases. If the speed of the escalator is 1.58 m/s, calculate the speed of the child.

Q: A tennis player hits the ball. The net is 15 m away. (a)lf the player hits the ball from a height of…

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Q: A ball is thrown upward at 4.6 m/s, from a height of 20 m above the ground.  How fast (m/s) does…

A: Given data:  Initial velocity = 4.6 m/s, upward Height = 20 m Required: Velocity of ball when hit…

Q: A student holds a ball 1.55 meters above the ground and drops it. Her friend uses a stopwatch and…

A: We have been given that h = 1.55 m t = 0.57 Using these values, the value of acceleration due to…

Q: A ball is thrown downward from the top of a 30.0 m tower with an initial speed of 15.0 m/s. Assuming…

A: Given Data:Initial speed of the rock Height of the rock To Determine:The speed of the ball just…

Q: You are on the roof of the lecture hall, 51.8 m above ground. As your physics professor, who is 1.8…

A: V=Speed of professor=1.2 m/su=initial velocity of egg=0 m/st=time required for egg to fall on…

Q: A train moves towards east with 95 km/h, while a car moves towards north with 60 km/h. What is the…

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Q: A package leaves the post office in the morning, located at x = 25 km. After traveling all day on…

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Q: Person A jogs east at a speed of 5 meters per second for 3 minutes, then turns north and jogs at 4…

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Q: As the first human astronaut to land on a distant planet, you are standing on the edge of a small…

A: Given data:  Maximum height reached = 3.0 m Height of cliff = 10 m Acceleration (a) = -5.6 j m/s2…

Q: To Merge into the highway you need to increase your speed from 50 km/h to 100 km/h. If your car can…

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Q: Ibrahim and Ismail are playing a slide in the playground at Taman Krubong Perdana. The slide…

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Q: A juggler is practicing tossing balls on a train which is moving north at 30 m/s. She tosses a ball…

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Q: After 3 seconds the speed of the rock is ____ m/s.

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Q: While dusting a bookshelf at the local college's huge library, Jean accidentally knocks a book off…

A: From equation of motion, final velocity of the body is v2 = u2 + 2as Where, v = final velocity u =…

Q: What is the speed of the rock just before it hits the street?

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Q: gh the road is lev

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Q: An olympic gymnast jumps up and down on a trampoline. If the gymnast's feet leave the trampoline at…

A: According to the principle of conservation of energy, the sum of the change in potential energy of…

Q: A thief is trying to escape from a parking garage after completing a robbery, and the thief’s car is…

A: Given, the height of the car is 1.4 m. Time taken by the door to close up to the height of 1.4m is,

Q: A small rock is thrown straight up from the edge of the roof of a building. Air resistance can be…

A: We are given the maximum height reached by rock above roof. We know that at top most point speed is…

Q: An attacker at the base of a castle wall 4.00 m high throws a rock straight up with speed 4.50 m/s…

A: “Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: A ball rolls off a 1.8 m high table with an initial speed 3.5. When it hits the ground, how far…

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Q: A thief is trying to escape from a parking garage after completing a robbery, and the thief’s car is…

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Q: In this exercise, an unmanned paper aircraft is sent straight down from the top of an office…

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Q: An elevator starts from the ground floor and moves up with a constant speed of 4 m/s. If a bolt…

A: Given: u=4m/s, t=2s A) The distance traveled by the lift (and bolt) in 2s is : d=ut=8m As the bolt…

Q: A ball is thrown downward from the top of a 40.0 m tower with an initial speed of 12.0 m/s. Assuming…

A: Height of building= 40 m Initial speed= 12 m/s Ball is thrown downward.

Q: diver jumps from a boat and descends to a depth of 20m. she skirts a coral reef and estimates that…

A: diver jumps from a boat and descends to a depth of 20m. she skirts a coral reef and estimates that…

Q: While riding on an elevator descending with a constant speed of 2.6 m/s, you accidentally drop a…

A: We have GivenElevator descending with constant speed =2.6 m/s

Q: Q15: A rock is thrown downward from the top of a 40.0-m- tall tower with an initial speed of 12 m/s.…

A: Given(s): The initial speed of the rock, u=12 m/s. The rock was thrown from a height of, h=40.0 m.…

Q: The athlete jumps with a pole and flies up to a height of 6,1 meters. What is the athlete's velocity…

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Q: A thief is trying to escape from a parking garage after completing a robbery, and the thief's car is…

A: Given Data : The speed of the thief's car is given as v = 12 ms. The distance of the thief's car…

Q: A ball was thrown on top of a building, downwards towards the ground. The initial velocity of the…

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Q: A thief is trying to escape from a parking garage after completing a robbery, and the thief’s car is…

A: Givenspeed of car (v)=11 m/sThief at a distance from door when a police flips switch (L)=14…

Q: A bridge that was 11.2 m long has been washed out by the rain several days ago. How fast must a car…

A: The given data are: l=11.2 md=3.3 m Here, l is the length of the bridge and d is the distance.

Q: Santa loses his footing and slides down a frictionless, snowy roof that is tilted at an angle of…

A: Given,

Q: A long jumper leaves the ground at an angle of 60.0° above the horizontal and at a speed of 6.0 m/s.…

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Q: A ball is thrown upward with a speed and direction such that it reaches a maximum height of 24.0 m…

A: Given, Height H = 24 m Speed at maximum height = 20 m /s

Q: An ant is in a corner of the ceiling in a cube-shaped room when it notices that someone has spilled…

A: Given data: Length of the side of a cubic room a=3 m.

Q: A daredevil decides to jump a canyon of width 10 m. To do so, he drives a motorcycle up an incline…

A: Given, Range, R = 10 mslope, θ = 15°

Q: A typical jetliner lands at a speed of 160 mi/h and decelerates at the rate of (10.0 mi/h)/s. If the…

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Q: A rocket is launched from a height of 3 m with an initial velocity of 15 m/s. At what time will the…

A: Given, Initial height of the rocket, h = 3 m initial speed of the rocket, u = 15 m/s

Distance and Speed

The speed, distance and time relation forms the basis of study of motion. You will need these concepts in the study of Mechanics. This concept is applicable for students who are studying the following courses –