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Question

A stone tied to a string of length L is whirled in a vertical circle with the other end of the string at the center. At a certain instant of time, the stone is at its lowest position and has a speed u. The magnitude of the change in its velocity as it reaches a position where the string is horizontal is:

A
u22gL
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B
2gL
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C
u2gL
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D
2(u2gL)
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Solution

The correct option is D 2(u2gL)
R.E.F image
From Energy conservation
V2=U22gL ___(1)
¯V=V2+U2
from eq(i)
¯V=U2+U22gL
¯V=2(U2gL)

1209853_1271082_ans_b95e01fc0d2e4f4db6c53eec14eaa870.jpeg

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