Question

A car moving on a plane surface applies breaks to reduce it's speed from 10m/s to 5m/s. The mass of the vehicle is 150g. Find the work done by brakes

Answer 1

Dear student,

$$\begin{gathered} Accordingtoworkenergytheorem, \\ Workdone=changeinK.E. \\ W=\frac{1}{2}\times m\times ({10}^2-5^2) \\ W=\frac{1}{2}\times 150\times 75 \\ W=5625J \end{gathered}$$


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