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In the above question T a is positive at...

In the above question `T` a is positive at the lowest point for

A

`u=sqrt(2gl)`

B

`u=sqrt(5gl)`

C

`u=sqrt(7gl)`

D

any value of `u`

Text Solution

Verified by Experts

The correct Answer is:
D
At lowest point `T` and `a` are always in same direction (towards centre).
:. `T.a` is always positive.
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