Question

Solve Q53

​Q53. An automobile moving at a speed of 72 km/h is brought to rest in 2 seconds by application of brakes. How much distance does the automobile covers in these 2 seconds ?

(A) 25 m (B) 20 m (C) 15 m (D) 10 m

Answer 1

Dear student
$$\begin{gathered} speed \\ u=\frac{5}{18}\times 72=20m/s \\ x=\left(\frac{u+v}{2}\right)\times t \\ x=\left(\frac{0+20}{2}\right)\times 2=20m \\ Regards \end{gathered}$$