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A small object of mass m, on the end of ...

A small object of mass m, on the end of a light cord, is held horizontally at a distance r from a fixed support as shown. The object is then released. What is the tension in the cord when the object is at the lowest point of its swing?

A

`mgl2`

B

`mg`

C

`2 mg`

D

`3 mg`

Text Solution

Verified by Experts

The correct Answer is:
D
Applying energy conservation, speed at lowest point `=sqrt(2 gr)`
`T - mg = (mv^2)/r = m/r (2 gr) implies T = 3 mg`.
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