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. `(F^2t^2)/(m)`
B. `(F^2t^2)/(2m)`
C. `(F^2t^2)/(3m)`
D. `(Ft)/(2m)`

Answer

B

Explanation

`a=(F)/(m),S=1/2(F/m)t^2,W_F=FS=F((Ft^2)/(2m))`