Question

a car increases its speed from 20 kilometre per hour to 30 kilometre per hour in 10 seconds its acceleration is ??

Answer 1

$$\begin{gathered} DearStudent, \\ Given, \\ u=20km/h=20\times \frac{5}{18}m/s,v=30km/h=30\times \frac{5}{18}m/s,t=10s \\ \left(\mathbf{1}\mathit{k}\mathit{m}\mathbf{/}\mathit{h}=\frac{1000m}{3600s}=\frac{10}{36}=\frac{\mathbf{5}}{\mathbf{18}}\mathit{m}\mathbf{/}\mathit{s}\right) \\ v=u+at \\ Henceaccelerationis, \\ a=\frac{v-u}{t}=\frac{\left(30-20\right)\times {\displaystyle \frac{5}{18}}}{10}=\frac{10\times \frac{5}{18}}{10}=\frac{\mathbf{5}}{\mathbf{18}}\mathit{m}\mathbf{/}{\mathit{s}}^{\mathbf{2}} \\ Regards.. \end{gathered}$$