1.

calculate the work required to be done to stop a car of 1650 kg moving at a velocity of 70 km/h?

Answer»
mass: 1650kg
velocity:70km/hr
v: 70×5/18
v: 19.4m/s

The car is in motion,so it's energy is
Kinetic energy: 1/2mv²
                           1/2×1650(19.4)²
                           310497J
The KE of car ,when it come to rest: 0J
WD on object=change in  KE
                        310497-0
                        310497J Ans




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