Question

For a projectile on ground, the maximum angle between instantaneous velocity and instantaneous acceleration is _____ and at _______ seconds.

• A. ${150}^{\circ },0.8s$
• B. ${60}^{\circ },0.8s$
• C. ${60}^{\circ },0.4s$
• D. ${120}^{\circ },0s$

Answer 1

The correct option is D ${120}^{\circ },0s$


Maximum angle is at the projection point.(After this the angle decreases continuously)
The angle between $g$ and initial velocity of projection is ${120}^{\circ }$