A tennis ball moves with a velocity of 25 m/s towards a wall. The ball bounces back with speed 22 m/s.

What was the average acceleration of the ball if the bounce lasted 3.2 ms?

Question

A tennis ball moves with a velocity of 25 m/s towards a wall. The ball bounces back with speed 22 m/s. 

What was the average acceleration of the ball if the bounce lasted 3.2 ms?

ksaimouli · Answer

3.2 time or velocity?

anonymous · Answer

velocity, milliseconds

ksaimouli · Answer

convert that ms in to m/s

ksaimouli · Answer

initial velocity =25 and final vel;ocity is 22

anonymous · Answer

velocity = 22m/s
time = 3,2ms = 0,0032 seconds
formula: a = v/t

so:

22/0,0032 = 6875

except the answer is 15000m/s^2

anonymous · Answer

hmm... I think I'm misundertanding the question

anonymous · Answer

delta V = Vf -Vi  = 22 - -25 =   47 m/s 
47 m/s /(.0032s) = 14,687m/s^2

anonymous · Answer

$$a=\frac{ \Delta  V }{ t }$$