Question

To test the quality of a tennis ball, you drop it onto a floor from a height of 4.00m . It rebounds to a height of 2.00 m. If the ball is in contact with the floor for 12.0ms,
(a) What is the magnitude of its average acceleration during the contact?
(b) is the acceleration up or down?

Answer 1

a) 0
b)down

note : this is situation before the ball rebounds. However ball will rebound in upward direction obviously

Answer 2

a)90 m/s^2
b)upward

Answer 3

bt average accelaration will be -9.8 + 9.8 /2 = 0...
if i m wrong then tell me

Answer 4

the wall will also exert a force on the ball during the contact which comes out to be 100 m/s^2