A spring is compressed so that it has 7.2 J of elastic potential energy. A 0.3 kg ball is placed on top of the spring. When the spring is released, how high will the ball go ?

since you're a real machine, your ama is always less than your ima, because you can never totally eliminate friction.

0.19 m/s and 0.45 m/s

resonant frequency

not too sure thinking all accelerations are pointed down