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- 5. A car with an initial velocity of 9_ m/s, accelerates at a constant rate of 3.6 m/s?. a. How much time is required for it to travel 300 meters? b. What is its velocity (in m/s) upon reaching 300 meters?2. A jet plane has a takeoff speed of vtakeoff = 73 m/s and can move along the runway at an average acceleration of 2.4 m/s2. The runway is 1.2 km. Write out the 3 Kinetic equations. a. b. Write out the values of initial position, initial velocity, and acceleration. How many seconds will it take for the plane to reach takeoff speed? с. d. How far will the plane have to travel to get to takeoff speed? will the plane be able to get to take off before it gets to the end of the runway? е.7. A construction worker accidentally drops a brick from a high scaffold. a. What is the velocity of the brick after 4.0 s? b. How far does the brick fall during this time? 8. An airplane accelerates down a runway at 3.20 m/s? for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff.
- At the end of a race a runner decelerates from a velocity of 8.70 m/s at a rate of 1.80 m/s2. A. How far in meters does she travel in the next 5.30 s? (Assume the deceleration of 1.80 m/s2is constant over the full 5.30 s.) B. What is her final velocity in m/s? C. Evaluate the result. Does it make sense? (Hint: what is the algebraic sign of the velocity, and what does it imply)A football player makes a touchdown run of 100 yards in a time of 1.5 seconds. What is the av.speed in m/s during his run? ( 1 yard = 0.9144 meters) DON'T ROUND YOUR ANSWER. a. 60.96 m/s b. 1.3716 m/s c. 0.6096 m/s d. 137.16 m/sA ball is dropped from a window 50 m above the ground. a) How long does it take the ball to reach theground?b) What is its final velocity?2. A pebble was dropped from the window of a building, 80 meters above the ground. a) How many seconds willit take the pebble to reach the ground? b) How fast is it after 2.0 seconds? c) When will its velocity be 25 m/s?3. A stone is tossed upward at the moment a ball is dropped from a height of 25 meters. The stone’s initialvelocity is 25 m/s. At what height will the two meet? In how many seconds.4. A ball is thrown downward with an initial velocity of 20 ft/s. a) How fast is it moving 2s later? b) How fardoes it fall in these time ?
- A car traveling at 20m/s is attempting to drive up an icy hill. When it getsonto the hill, it is able to go 10 meters before it hits some ice and begins sliding. Assume the hillis a 10 degree incline. A. How far up the hill does the car travel before it starts to slide back down? Make sure toinclude the initial 10 meters in your final distance. B. If the car then slides all the way back to the bottom of the hill, what is its speed when itgets to the bottom? Assume it doesn’t gain traction back, so it is sliding with no frictionthe whole way down.b. What is the average speed of the train between the two stations? 2. A car accelerates from 12m/s to 25 m/s in 6.0 s a. What was its acceleration? b. How far did it travel in this time? 3. An obiect was thrown vertically upward 10 m/s from the top of a buildine 20 mA small rocket fired straight up. When a height of 5.0km and velocity of 200.0m/s, it releases its booster and enters free fall. Calculate the total time of flight between releasing its boosters and falling back nd hitting the ground. A. 20.4s B. 40.8s C. 37.9s D. 58.3 s
- 4. There are two frogs named Eroggy, and Jumpy. They jumped from the top of a vertical cliff. Froggy just drops and reaches the ground in 3.50 s, while Jumpy jumps horizontally ((bida bida siva, char! Hahall with an initial speed 95 cm/s. a. How far from the base of the cliff will Jumpy hit the ground? b. How high is the vertical cliff? c. If Jumpy jumps with an angle of 30 degrees with respect to the horizontal, what should be its initial velocity for it to land on the same spot as he did when he jumped horizontally?A rock is tossed straight up with a speed of 20 m/s. When it returns, it falls into a hole 10 m deep.a. What is the rock’s velocity as it hits the bottom of the hole?b. How long is the rock in the air, froA motorboat starting from rest on a straight travels in straight line on a lake. A. If the boat achieves a speed of 8.0 m/s in 10s,what is the boats average acceleration? B. Then, in 5.0 more seconds, the boats speed is 12m/s. What is the boats average acceleration for the total time?