Question

A motor car is moving with a velocity of 108km/h and it takes 4 seconds to stop after the brakes are applied. Calculate the force exerted by the breaks on the motor car. If the mass along with the passengers is 1000 kg

Answer 1

initial velocity(u)= 108km/h=30m/sec
final velocity(v)=0km/h=0m/sec
mass(m)=1000kg
time(t)=4sec
force=[m(v-u)]/t
        =[1000(30-0)]/4
        =[1000*30]/4
        =30000/4
        =7500 
force=7500newton

Answer 2

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