Question

what is projectile motion

Answer 1

Projectile motion is a form of motion experienced by an object or particle (a projectile) that is thrown near the Earth's surface and moves along a curved path under the action of gravity only (in particular, the effects of air resistance are assumed to be negligible). 

Answer 2

A projectile is the name given to any body which once thrown into space with some initial velocity moves thereafter under the influence of gravity alone without being propelled by any engine or fuel.the path followed by the body is projectile motion