Part A. With what minimum speed must you toss a 190 g ball straight up to hit the 12 m-high roof of the gymnasium if you release the ball 1.5 m above the ground? Solve this problem using energy. Part B. with what speed does the ball hit the ground?

Answer 1

Intial KE+ initialPE= mg(12)
solve for v in the KE formula.
Notice mass divides out.

Answer 2

there is a trick here, it already is up 1.5 meters,so change the right side to
mg (12-1.5). I bet the teacher put that in just to trick everyone.