Question

A car of mass 2000 kg moving with speed of 54 km/hr can be stopped by applying brakes after travelling at least 5 m distance. The force applied by brakes is

Answer 1

Hi...!!!
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Answer 2

hiiii friend
here is your answer
initial velocity=54km/hr or 15m/sec
final velocity=0m/sec ( as the car stops)
distance=5m
now,⬇
${v}^{2} = {u}^{2} + 2as \\ {0}^{2} = {15}^{2} + 2a \times 5 \\ 2a = \frac{ - 225}{5} \\ a = \frac{ - 45}{2} \\ a = - 22.5m {sec}^{ - 2}$
so the acceleration =-22.5m/sec^2
as, f=m×a
so, f=2000×-22.5=-45000N


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