# Question #700d5

##### 1 Answer

#### Explanation:

We observe that the projectile when it just hits the ground will have velocity

Also it will have velocity

Assuming that air resistance is negligible. And noticing that both velocities are perpendicular to each other and therefore, independent of one another, there is no change in the velocity

To calculate velocity

The projectile has a potential energy when it is launched which is given by

As the ball falls down, due to the Law of Conversion of Energy, this gets converted in to the kinetic energy of the projectile in the

Equating the two at a point when projectile just hits ground

or

We know that acceleration due to gravity

We obtain