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MCQ
If the kinetic energy of a body is 50 J when its speed is v, its kinetic energy when the speed becomes 2v is:
Unit-6 Work and Energy
A 200 J
B 100 J
C 150 J
D 25 J
Explanation

KE is proportional to v^2, so doubling v makes KE 4 times: 50 x 4 = 200 J.

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