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A motor car is moving with a velocity of...

A motor car is moving with a velocity of `108 km//h` and it takes `4 second` to stop after the brakes are applied. Calculate the force exerted by the brakes on the motorcar if its mass along with the passenger is `1000 kg`.

Text Solution

Verified by Experts

Here `u=108 km h^-1` =`(108 times 1000m)/(60 times 60s)=30 ms^-1`
`t=4s, v=0 , F=? , m=1000 kg`
`F=ma =(m(v-u))/t=(1000(0-30))/4=-7500N`
Negative sign indicates that the force is opposing.
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