Question

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`

Answer 1

Correct Answer - C
`v_(x) = u_(x)`
`v cos alpha = u cos theta`
`v = ucos theta. Sec alpha`