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Question

A stone of mass m tied to a string of length 60cm is whirled in a vertical circle. If the total energy of the stone at the highest position is 250J, what is the value of m? (in kg)

A
20
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B
19
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C
18
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D
17
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Solution

The correct option is D 17
60 cm = 0.6 m
Total energy in vertical circular motion is given by
E=5mgr/2
m=2E/5gr
E=2250/59.80.6=17Kg

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