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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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
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