Question

A driver applies brakes when he sees a child on the railway track, the speed of the train reduces from 54 km/h to 18 km/h in 5 s. what is the distance travelled by the train during this interval of time?

Answer 1

$$\begin{gathered} u=\frac{5}{18}\times 54=15m/s \\ v=\frac{5}{18}\times 18=5m/s \\ U\sin gtheformula \\ s=\left(\frac{u+v}{2}\right)\times t \\ s=\left(\frac{15+5}{2}\right)\times 5 \\ s=\frac{20}{2}\times 5=10\times 5=50m \\ Regards \end{gathered}$$Dear student