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Question

A bullet of mass 100 g has attained a velocity of 1080 km h1 towards the target. What would its kinetic energy be at that moment?

A
4500 J
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B
4240 J
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C
4300 J
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D
4750 J
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Solution

The correct option is A 4500 J
Given, mass of the body, m=100 g=0.1 kg and velocity of the body, v=1000 km h1=1080×100060×60
=300 ms1
Kinetic energy, K.E.=12mv2
Substituting the values in the expression of K.E, we get:

K.E =12×0.1×3002 = 4500 J


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