### What is the magnitude of an average acceleration of the ball

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Question1

A hotel elevator ascends 160 with a utmost speed of 4.9. Its acceleration and deceleration both have a magnitude of 1.5.

How far does an elevator move while accelerating to full speed from rest?

How long does it take to make the complete trip from bottom to top?

Question2

A police car is travelling at a velocity of 18.0 m/s due north, while a car zooms by at a constant velocity of 46.0 m/s due north. After a reaction time 0.400 s the policeman begins to pursue the speeder with an acceleration of 4.00 m/s^2. Including reaction time, how long does it take for the police car to grab up with the speeder?

Question3

A 50.0g ball travelling at 25m/s bounces off a brick wall and rebounds at 22m/s. If the ball is in contact with the wall for 3.50 ms, what is the magnitude of the average acceleration of the ball during this time period?

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