Question

A ball is thrown vertically upwards at 4ms-1 and returns yo the throwers hand.calculate the maximum height reached by the ball

Answer 1

its initial kinetic energy is converted to gravitational potential energy, so at the top,
finalPE=initial KE
mgh=1/2 m v^2
h=1/2 4^2/9.8=8/9.8 meters.