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Question

A simple pendulum of length l and mass m is initially at its lowest position. It is given the minimum horizontal speed necessary to move in a circular path about the point of suspension. The tension in the string at the lowest position of the bob is

A
3mg
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B
4mg
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C
5mg
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D
6mg
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Solution

The correct option is B 6mg
Equation of motion, mac=Tmg where ac=v2r
T=mv2r+mg
Also as the bob completes the vertical motion i-e, v=5gr
T=m(5gr)r+mg=6mg

439042_240806_ans_6ea81c03c9b14497be8bfb50401b1f22.png

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