Question

A stone of mass 1kg is thrown vertically downward from a rope at a velocity of 2m/s. At the moment it hits the soils, the stone has a kinetic energy of 200J. What is the height from which the stone is thrown?

Answer 1

$E=\frac{mv^2}2+mgh,$

$h=\frac E{mg}-\frac{v^2}{2g}=19.8~m.$