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A particle is projected with a velocity ...

A particle is projected with a velocity u making an angle `theta` with the horizontal. At any instant its velocity becomes v which is perpendicular to the initial velocity u. Then v is

A

`u cos theta`

B

`u tan theta`

C

`u cot theta`

D

`u sec theta`

Text Solution

Verified by Experts

The correct Answer is:
C

`because` horizontal component of velocity remains same
`therefore u cos theta=v cos (90-theta)`
`u cos theta=v sin theta rArr v=ucot theta`
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