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Q.

Kinetic energy of a moving object is 100 J. If its speed is doubled, then its kinetic energy will become


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a

25 J

b

50 J

c

200 J

d

400 J 

answer is D.

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Detailed Solution

This is because kinetic energy depends on the velocity of the object squared. Therefore when the velocity of an object doubles then the kinetic energy of the body becomes 4 times. Hence, the kinetic energy is equal to half mass times velocity squared. If, velocity will be doubled then kinetic energy will be 4 times. Thus, the kinetic energy will become 400 J.
 
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