Question

a motor car is moving with velocity of 108 km per hour and it takes 45 to stop after the brakes are applied calculate the force exerted by the brake on the motor car if its mass along with the passenger is thousand kg
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Answer 1

initial velocity 108 km per hour

=108*5/18

=30m/s

final velocity =0m/s

time 4s

acceleration =v-u/t

=0-30/4

=-7.5m/s^2

force = mass * acceleration

= 1000* (-7.5)

= -7500N




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