A soft tennis ball is dropped onto a hard floor from a

Question

Solve the all parts of given problem:

Problem: A soft tennis ball is dropped onto a hard floor from a height of 1.75 m and rebounds to a height of 1.30 m. (Assume that the positive direction is upward.)

Part A: Calculate its velocity just before it strikes the floor.

m/s

Part B: Calculate its velocity just after it leaves the floor on its way back up.

m/s

Part C: Calculate its acceleration during contact with the floor if that contact lasts 3.50 ms.

m/s²

Part D: How much did the ball compress during its collision with the floor, assuming the floor is absolutely rigid?

m

I don't know how to get that answer for the above problem. Please help! Thanks.