Question

Q.: A motorcar is moving with a velocity of 108 km/h and it takes 4 s to stop after the brakes are applied. Calculate the force exerted by the brakes on the motorcar if its mass along with the passengers is 1000 kg.

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Answer 1

Explanation:

u=108km/h=(108×1000)/3600m/s=30m/s

v=0

t=4s

v=u+at

0=30+a×4

a=-30/4

a=-7.5m/s^2

force=mass×acceleration

F=1000×(-7.5)=-7500N

negative sign indicates that force is decreasing