Question

Mickey, a daredevil mouse of mass 0.0197 kg, is attempting to become the world's first "mouse cannonball." He is loaded into a spring‑powered gun pointing up at some angle and is shot into the air. The gun's spring has a force constant of 93.3 N/m and is initially compressed a distance of 0.139 m from its relaxed position. If Mickey has a constant horizontal speed of 2.31 m/s while he is flying through the air, how high ℎ above his initial location in the gun does Mickey soar? Assume ?=9.81 m/s2.

I got 4.57m, I'm not sure what the correct answer is nor do I understand what I did wrong.

Answer 1