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Question

Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60kmh1

A
208333J
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B
208333J
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C
209333J
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D
207333J
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Solution

The correct option is A 208333J
Given, massofcar,m=1500kg;

velocityofcar,v=60kmh1=60×518=503m/s

Workdone=Changeinkineticenergyofthecar

or W=12mv212mu2=12m(v2u2)

or W=12(1500)[(0)2(50/3)2]

or W=12×1500×25009=208333J

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