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A projectile is fired with a speed u at ...

A projectile is fired with a speed u at an angle `theta` with the horizontal. Find its speed when its direction of motion makes an angle `alpha` with the horizontal.

A

`u sec theta cos alpha`

B

`u sec theta sin alpha`

C

`u cos theta sec alpha`

D

`u sin theta sec alpha`

Text Solution

Verified by Experts

The correct Answer is:
C
`v_(x) = u_(x)`
`v cos alpha = u cos theta`
`v = ucos theta. Sec alpha`
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