Problem: An obnoxious brat assigns his 0.0215-kilogram pet mouse Mickey the role of stunt mouse by stuffing him into a spring gun and shooting him up into the air at some angle. The gun\'s spring has a force constant of 94.9 N/m and is initially compressed 0.139 m. When Mickey reaches maximum height, he has a horizontal velocity with a speed of 2.13 m/s.
Part A: How high above his initial location in the gun does Mickey soar?
I need help to find how high above his initial location in the gun does Mickey soar.