Question

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
A. `500sqrt(2) m//s^(2)` upwards
B. `1800sqrt(2) m//s^(2)` downwards
C. `1500sqrt(2) m//s^(2)` upwards
D. `1500sqrt(2) m//s^(2)` downwards

Answer 1

Correct Answer - C
`a=(sqrt(2gh_(2))-(-sqrt(2gh_(1))))/(Delta t)`