A ball, M $=3$ kg is released from rest $($vi $=0)$ at a height, h $=2$ m above the ground. $($a$)$

What is the kinetic energy of the ball just before it hits the ground? What is the change in the

potential energy, $\backslash$Delta U during this motion? $($b$)$ Find the kinetic energy of the ball at a height, y

$=1\mathrm{.}2$ m above the ground. $($Take g $=10$ m$/$s$2).$