A toy car of mass \(8 \mathrm{~kg}\) initially at rest is accelerated at a rate of \(2 \mathrm{~m} / \mathrm{s}\) for \(3 \operatorname{secs}\). The kinetic energy of the toy car is ____________
Explanation
\begin{array}{l}
\mathrm{m}=8 \mathrm{~kg}, \mathrm{u}=0, \mathrm{a}=2 \mathrm{~m} / \mathrm{s}^2, \mathrm{t}=3 \mathrm{~s} \text {, }\\
\mathrm{v}=\mathrm{u}+\mathrm{at} \text {; }\\
=0+2 \times 3\\
=6 \mathrm{~m} / \mathrm{s}\\
\text { K.E. }=\frac{1}{2} \mathrm{mv}^2\\
=\frac{1}{2} \times 8 \times 6^2\\
=144 \mathrm{~J}
\end{array}
