Motion In A Plane

A child stands on the edge of the cliff \(10 \mathrm{~m}\) above the ground and throws a stone horizontally with an initial speed of \(5 \mathrm{~ms}^{-1}\). Neglecting the air resistance, the speed with which the stone hits the ground will be \(\mathrm{ms}^{-1}\) (given, \(g=10 \mathrm{~ms}^{-2}\) ).