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 car moves from the point (6 m) i + (7 m) j  to the point (6 m) i - (6 m) j in 8 s. What is the…

A: Given data: Initial position of the car, xi=6 mi^+7 mj^ Final position of the car,  xf=6 m i^-6 m j^…

Q: The velocity versus time graph for a golf ball struck from the ground is shown in the graph below.…

A: From 2 to 2.5 s, the slope of the graph is negative and from 2.5 to 5 s, the slope of the graph is…

Q: A student in Physics 211 decides to do an experiment. They travel to a city and climb to the roof of…

A: height of building (h) = 300 m initial velocity of first rock (u1) = 0 msinitial velocity of second…

Q: A woman on a bridge 108 m high sees a raft floating at a constant speed on the river below. She…

A: The woman is at a height of 108 m from the raft, which is travelling at a constant speed in the…

Q: An object slides off a frictionless, horizontal table from a height of 1.40 m above the floor. It…

A: In the question it is given that height of the table,h=1.40 mdistance of the the object strict point…

Q: 3) You throw a ball straight up. The ball leaves your hand at a height of 2.00 m above the ground…

A:

Q: Two students are asked to find the height of a particular building using a barometer. Instead of…

A: GivenBarometer is thrown from a building of height H ,Student 1 reporst fall time t1=2.0sStudent 2…

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

A:

Q: crate slides down a ramp.   Once reaching the bottom of the ramp, the crate slides 15 m…

A:

Q: The position of a honey bee (in units of meters) at t = 0.00 s is given by A = 2.00i+ 2.00j-3.00k.…

A:

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: two balls are thrown simultaneously one straight up from the base of the bridge with a speed of 9.0…

A: The values given in the problem are: The velocity of ball 1 is given as: u1=9.0 m/sThe velocity of…

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: There are two best friends named Kaela and Georgie. Kaela is on top of the first storey building and…

A: Given: Length of 1 storey, L= 3.378 m gravity, g = 9.8 m/s2 To Find: 1) time taken when they meet 2)…

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: boy throws a ball upward in the vertical direction at the base of a hill 40 m high while his friend…

A: Find the time period of the balls collide with each other at certain height. t=2hg=220 m9.8…

Q: You attach a meter stick to an oak tree, such that the top of the meter stick is 2.67 meters above…

A: The diagram of the system is given below:                                               According…

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: 46. In designing a stunt for the next installment of the great Christmas film Die Hard, John McClane…

A: The elevator travels downward at a speed vE=2.5 m/s, and is d=8.0 m below John when he steps off of…

Q: Suppose you are watching the destruction of a bridge. The bridge is blown up and the sounds of the…

A: The speed of the sound is 344 m/s.

Q: An object is thrown upwards from the ground level at a speed of 58m/s. It travels upwards to the…

A: Recall Vf2=Vi2-2gh

Q: You throw a m =0.9 kg ball straight up, giving it an initial velocity of magnitude v= 10 m/s.…

A: Given data:  Mass (m) = 0.9 kg Initial velocity (v0) = 10 m/s Acceleration due to gravity (g) = 9.8…

Q: You and your dog go for a walk to the park. On the way, your dog takes many side trips to chase…

A: In Physics, there are two things, one is displacement and the other is the total distance traveled.…

Q: Two pebbles are thrown simultaneously from the top of the building with a speed of 20 m/s. One is…

A:

Q: A crow flies carrying a shiny rock. The crow reaches an altitude of 65m and is flying 34.5 m/h. It…

A: Given,v0y=0 m/s Unit conversion: 1 h = 3600 s 1 km = 1000 m the initial speed of the crow (same as…

Q: A boat crossing a river travels north with a velocity of 10.0 kph relative to the water. The…

A:

Q: A 2.5 m wide trench crosses a bicycle path and a 15-degree ascending ramp has been constructed on…

A:

Q: A car is traveling with a constant speed along a road that has a form of a square. The car starts at…

A: Given:road is of square shape ABCDFrom the diagram below, the car starts fromone side lets say from…

Q: uppose a Chinook salmon needs to jump a waterfall that is 1.35 m high. If the fish starts from a…

A:

Q: At the top of a cliff 98 m high, Raoul throws a rock upward with velocity 29 m/s. How much later…

A:

Q: An object is thrown straight upward with an initial velocity of 20.0 m/s j. Upon reaching the ground…

A: Given:- Initial velocity =20 m/s j final velocity =-30.8 m/s j Find:- What distance above ground…

Q: The position of a particle is r(t) = (5.0t²î – 4.0ĵ + 6.0t³k) m. (a) What is the velocity of the…

A:

Q: A particle has a velocity of v= (3i+5j)m/s and a constant acceleration of a=(-1.5i-4.5j)m/s^2 What…

A:

Q: An object is launched at a velocity of 43 m/s in a direction making an angle of 36 degrees upward…

A:

Q: You are an engineer in charge of designing a new generation of elevators for a prospective upgrade…

A:

Q: An elevator boy is operating an elevator which is ascending at a constant velocity of 2.4 m/s. While…

A: The velocity of coin is zero with respect to the person inside the elevator. the displacement is,…

Q: A stone was dropped freely from a balloon at a height of 190 m above the ground level. The balloon…

A: initial height (h) = 190 m initial velocity = u final speed (|v|) = 68 m/s

Q: physicist is studying the position of a baseball being thrown up in the air. He notices that the…

A:

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 –