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 floor for 0.01 s then the average acceleration during contact is nearly

Options

A. `2100 m/s^2` downwards
B. `2100 m/s^2` upwards
C. `1400 m/s^2`
D. `700 m/s^2`

Answer

B