Question

The speed of a projectile at its maximum height is half of its initial speed. The angle of projection is -

• A. ${15}^o$
• B. ${30}^o$
• C. ${45}^o$
• D. ${60}^o$

Answer 1

The correct option is D ${60}^o$

$ucos\theta =0.5u.$

u is common on both side, so it going to be cancel out.

$cos\theta =0.5$

$\theta =co{s}^{-1}\left(0.5\right)$

$\theta ={60}^0.$