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A ball of moist clay falls 17.7 m to the ground. It is in contact with the ground for 21.0 ms before stopping. (a) What is the average acceleration of the ball during the time it is in contact with the ground? (Treat the ball as a particle.) (b) Is the average acceleration up or down?

A jogger accelerates from rest to 3.12 m/s in 3.52 s. A car accelerate from 22.2 to 39.7 m/s also in 3.52 s. (a) Find the magnitude of the acceleration of the jogger. (b) Determine the magnitude of the acceleration of the car. (c) How much futher does the car travel than the jogger during the 3.52 s?

An object has an initial velocity of 15 m/s.  How long must it accelerate at a constant rate of 3 m/s2 before its final velocity is equal to twice its initial velocity?

A person walks 20.0 meters in a straight line. Then the person turns around and walks back 18.0 meters along the same line. The time for the walk is 9.00 seconds.(a) What is the average speed for this walk?(b) What is the average velocity for this walk?(c) What is the displacement?(d) What is the total distance?

A particle moves along one dimension with a constant acceleration of 3.45 m/s2 over a time interval. At the end of this interval it has reached a velocity of 10.2 m/s. (a) If its original velocity is 5.10 m/s, what is its displacement (in m) during the time interval?   m (b) What is the distance it travels (in m) during this interval?   m (c) A second particle moves in one dimension, also with a constant acceleration of 3.45 m/s2 , but over some different time interval. Like the first particle, its velocity at the end of the interval is 10.2 m/s, but its initial velocity is  −5.10 m/s.  What is the displacement (in m) of the second particle over this interval?   m (d) What is the total distance traveled (in m) by the second particle in part (c), during the interval in part (c)?  m

A runner travels 100 m in 10.0 s. Assume that it takes him 1.50 s to reach his top speed, which is then maintained for the rest of the race. Find his (a) average speed; (b) acceleration during the first 1.50 s ; (c) maximum speed