At what point of a projectile motion acceleration and velocity are perpendicular to each other

What is a projectile motion ?

A projectile is an object projected into air with a velocity V so that it is moving under the influence of gravity. a)What is the shape of the path of projectile? b)As a projectile moves in its path,is there any point along the path where the velocity and acceleration vectors are perpendicular to each other. c)If E is energy with a projectile is projected, (i)What is the kinetic energy at the highest point. (ii)What is P.E at highest point?

In a projectile motion the velocity

In a projectile motion the velocity

In a projectile motion the velocity

In a projectile motion the velocity

In projectile motion velocity vector is always perpendicular to acceleration.

In a projectile motion the velocity (a) is always perpendicular to the acceleration (b) is not always perpendicular to the acceleration (c) is perpendicular to the acceleration for one instant only (d) is perpendicular to the acceleration for two instants.