A block of mass `m` at rest is acted upon by a force `F` for a time t. The kinetic energy of block after time t is

Options

A. 2 Ftm
B. `(2Ft)/(m)`
C. `(Ft)/(m)`
D. `(F^2t^2)/(2m)`

Answer

D

Explanation

`E=(P^2)/(2m)=((Ft)^2)/(2m)` {F=`P/t`}
`E=(F^2t^2)/(2m)`