A particle is projected from a point O with a velocity u at an angle `alpha` (upwards) to the horizontal. At a certain point P it moves at right angles to its initial direction. It follows that:

A particle is projected from a point P with a velocity v at an angle theta with horizontal. At a certain point Q it moves at right angles to its initial direction. Then

A particle is projected from a point P with a velocity v at an angle theta with horizontal. At a certain point Q it moves at right angles to its initial direction. Then

A particle is projected from a point P with a velocity v at an angle theta with horizontal. At a certain point Q it moves at right angles to its initial direction. Then

A particle is projected from a point P with a velocity v at an angle theta with horizontal. At a certain point Q it moves at right angles to its initial direction. Then

A particle is projected from a point O with velocity u in a direction making an angle alpha upward with the horizontal. AT P , it is moving at right angles to its initial direction of projection . Its velocity at P is .

A particle is projected from a point O with velocity u in a direction making an angle alpha upward with the horizontal. AT P , it is moving at right angles to its initial direction of projection . Its velocity at P is .

A particle is project d from point A with velocity u at an angle alpha with horizontal. In its parabolic path, at point P the particle is moving at right angles to its initial direction of projection. Its velocity at P is: