A stone is dropped from a certain height which can reach the ground in `5 s`. It is stopped after `3 s` of its fall and then it is again released. The total time taken by the stone to reach the ground will be .

Options

A. 6
B. 6.5 s
C. 7 sec
D. 7.5 s

Answer

C

Explanation

`h=h_(1)+h_(2),(1)/(2)g t^(2)=(1)/(2)g t_(1)^(2)+(1)/(2)g t_(2)^(2),t_("tot")=t_(1)+t_(2)`