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The Equations of Motion

A car of mass...

Question

A car of mass 480 kg moving at a speed of 54 km h-1 is stopped by applying brakes in 10s. Calculate the force applied by the brakes.

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Solution

given that ;

M= 480 kg

u= 54km/hr×5/18= 15m/s

v=0

t=10s

Force= kma

=k (m (v-u))/t (k's value is 1)

=1(480 (-15)/10)

=48*-15= -720kgm/s^2

= -720N

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