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A partical is moving in the vertical pla...

A partical is moving in the vertical plane . It is attached at one end of a string of length `l` whose other end is fixed. The velocity at the lower point is `u`. The tension in the string is `vec T` and velocity of the partical is `vec v` at any position. Then, which of the following quantity will remain constant.

A

`vec T. vec v`

B

kinetic energy

C

Gravitational potential energy

D

`vec Txx vec v`

Text Solution

Verified by Experts

The correct Answer is:
A
The tension vector `vec T` is always normal to velocity vector. Hence `vec T. vec v` is always zero.
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