A car of mass 1200 kg is moving at a speed of 108km/h. It's stopped in 5s, on applying brakes. Calculate the force applied by the brakes and total work done.
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Mass of car=1200kg
u=108 km/h
v=0
T=5s
F=m(v-u)/t
=1200(0-108)/5
=-25920 N
The negative sign here represents that the force applied is in the opposite direction.
Displacement=Speed×Time
=108×5
=540 km
Work done=FS
=-25920×540
=-13,996,800 J
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