Question

At the top of the trajectory of a projectile, the directions of its velocity and acceleration are
A. perpendicular to each other
B. parallel to each other
C. inclined to each other ant an angle of `45^(@)`
D. anti-parallel to each other

Answer 1

(a) Direction of velocity is always tangent to the 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.