Physics - W.E.P. Question with Solution | TestHub

Given $m=1\text{ kg}$, $u=0$, $v=10\text{ m/s}$ at $t=2\text{ s}$.

Using the equation of motion $v=u+at$:

$10=0+a(2)$

$a=5{\text{ m/s}}^2$

The force acting on the body is:

$F=ma=1\times 5=5\text{ N}$

The velocity of the body at $t=1\text{ s}$ is:

$v^{\prime }=u+at=0+5(1)=5\text{ m/s}$

The power exerted on the body at $t=1\text{ s}$ is:

$P=F{v}^{\prime }=5\times 5=25\text{ W}$

Answer: 25 W