A partical of mass `m` is driven by a machine that deleveres a constant power `k` watts. If the partical starts from rest the force on the partical at time `t` is

Options

A. `sqrt(mk)" " t^(-1//2)`
B. `sqrt(2mk)" " t^(-1//2)`
C. `(1)/(2)sqrt(mk)" " t^(-1//2)`
D. `sqrt((mk)/(2))" " t^(-1//2)`