Projectile motion is a type of motion of an object which is thrown into the air and subject only to the acceleration of gravity.
When an object is projected from rest state at an upward angle, its initial velocity can be resolved into two components. The upward velocity undergoes constant downward acceleration. This result in it rising to a highest point where it stop for sometime and then falling backward to the ground due to the gravitational force of the earth.
During the projectile motion the body experience two components i.e. horizontal velocity component and vertical velocity component. The horizontal velocity component (vx) describes the influence of the velocity in displacing the projectile horizontally whereas the vertical velocity component (vy) describes the influence of the velocity in displacing or moving the projectile vertically.
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