Before a rubber ball bounces off from the floor the ball is in contact with the floor for a fraction of second. Which of the following statements are correct-

A ball is dropped on the floor from a height of 10m. It rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.01 seconds, What is the average acceleration during contact.

A ball is dropped on to the floor from a height of 10 m. It rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.01 sec, what is the average acceleration during contact ?

When a ball drops onto the floor it bounces. Why does it bounce ?

A ball dropped from a height of 10 m rebounds from the floor and rises to a height of 2.5 m. If the ball spends 0.01 s in contact with the floor then find out the average acceleration during that contact.