question_answer

A ball is dropped on to the floor from a height of 10m. It rebounds to a height of 2.5m. If the ball is in contact with floor for \[{{10}^{-2}}\] sec, what is the average acceleration during contact?

A) \[700\text{ }m/{{s}^{2}}\]      

B) \[1400\text{ }m/{{s}^{2}}\]

C) \[2100\text{ }m/{{s}^{2}}\]                 

D) \[2800\text{ }m/{{s}^{2}}\]