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Q.

The string of a pendulum is horizontal. The mass of bob attached to it is m. Now, the string is released. The tension in the string in the lowest positions, is

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a

2 mg

b

3 mg

c

mg

d

4 mg

answer is C.

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Detailed Solution

v2=2gh=2gR

Question Image

T-mg=mv2r

Substituting value of v2, we get

T=3mg

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The string of a pendulum is horizontal. The mass of bob attached to it is m. Now, the string is released. The tension in the string in the lowest positions, is