Question

A projectile is fired with a velocity $u$ making an angle $\theta$ with the horizontal. What is the magnitude of change in velocity when it is at the highest pont?

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

Answer 1

The correct option is C $u\sin \theta$

The thing to note is when the projectile reaches it's highest point, it has lost all of its vertical velocity.

The vertical velocity of this projectile is $u\sin \theta$ and since the projectile loses this velocity, it would have a difference of $u\sin \theta$.