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

Given, mass of object$\left(m\right)=100 \mathrm{g}$

$=100\times {10}^{-3} \mathrm{k}\mathrm{g}$

Velocity of object$\left(v\right)=10\widehat{\mathit{i}} \mathrm{m}/\mathrm{s}\mathrm{ }$

Acceleration of object$\left(a\right)=(20\widehat{\mathit{i}}+10\widehat{\mathit{j}}) \mathrm{m}/{\mathrm{s}}^2$

We know that,

$\frac{d\left(KE\right)}{dt}=F.v=ma.v\left[\because K.E.=\frac{1}{2}m{v}^2\right]$

$=(100\times {10}^{-3})(20\widehat{i}+10\widehat{j}).(10\widehat{\mathit{i}})$

$=100\times {10}^{-3}\times 200$

$=\frac{100\times 200}{1000}=20\mathrm{ kg}{\mathrm{ m}}^2/{\mathrm{s}}^3$