A ball dropped on to the floor from a height of 40 m and rebounds to a height of 10 m. If the ball is in contact with the floor for 0.02 s, its average acceleration during contact is

A ball dropped on to the floor from a height of 40 m and rebounds to a

1.	A ball dropped on to the floor from a height of 40 m and rebounds to a height of 10 m. If the ball is in contact with the floor for 0.02 s, its average acceleration during contact is
Answer» `1050m//s^(2)` `2100m//s^(2)` `9.8m//s^(2)` `210m//s^(2)` ANSWER :B