Q. At the top of the trajectory of a projectile, the direction of its velocity and acceleration are
A) perpendicular to each other
B) parallel to each other
C) inclined to each other at angle of $45{^\circ}$
D) antiparallel to each other
Explanation
(a) Direction of velocity is always tangent to path, so at the top of trajectory it is in horizontal direction and acceleration due to gravity is always in vertically downward direction. Hence, v and g are perpendicular to each other.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.