A) 20J
B) 10J
C) \[4\sqrt{5}J\]
D) \[10\left( \sqrt{5}-1 \right)J\]
Correct Answer: A
Solution :
Difference in kinetic energy = \[2mg\,r=2\times 1\times 10\times 1=20J\]You need to login to perform this action.
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