A ball is dropped on to a fixed horizontal surface from a height h, the coefficient of restitution is e. the average speed of the ball from the instant it is dropped till it goes to maximum height after first impact with ground.

Options

A. `((1+e)sqrt(2gh))/((1-e))`
B. `((1+e^(2)))/((1+e)) sqrt((gh)/2)`
C. `((1-e^(2))sqrt(2gh))/((1+e)^(2))`
D. `((1-e)sqrt(2gh))/((1+e))`

Answer

B