Having trouble with this physics question, can you please explain with the answer:
Question: A soft tennis ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.51 m.
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 contacts last 3.50ms.
Part D: How much did the ball compress during its collision with the floor, assuming the floor is absolutely rigid?
m
Explain how you came up the prefixes and answer please.