Q. A projectile is fired with a velocity $v$ at an angle $\theta$ with the horizontal. The speed of the projectile when its direction of motion makes an angle $\beta$ with the horizontal is
A) $v\cos\theta$
B) $v\cos\theta\cos\beta$
C) $v\cos\theta\sec\beta$
D) $v\cos\theta\tan\beta$
Explanation
(c) $V\cos{\beta = v\cos\theta}$
or $V = v\cos{\theta\sec\beta}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.