Question

Find the average velocity of a projectile between the instances it crosses one third the maximum height. It is projected with an initial velocity $u$ making an angle $\theta$ with the vertical.

• A. $u\cos \theta$
• B. $u$
• C. $u\sin \theta$
• D. $u\tan \theta$

Answer 1

Answer: (C)

$u\sin \theta$

There will be a pair of points for which vertical velocities at the same height are in opposite direction and therefore their average sum $=0$
It is the horizontal velocity which is uniform and hence $v_{av}=u_x=u\sin \theta$