Physics

To find the height from which the cement block was dropped, we can use the kinetic energy and gravitational potential energy relationship.

The block was dropped from rest, so all its initial energy is potential energy. We can use the formula for gravitational potential energy: PE = mgh

Since there's no forces other than gravity acted on the block as it fell, the total mechanical energy is conserved. The initial potential energy is entirely converted into kinetic energy.

Therefore, the kinetic energy when it hit the ground is equal to the initial potential energy:

Rearranging the equation, we have: