With what minimum speed must you toss a 160 ball straight up to hit the 15 -high roof of the gymnasium if you release the ball 1.7 above the ground? Solve this problem using energy.

Answer 1

Is the mass of the ball in kg, grams or pounds or ounces? I assume your distances are in feet.

Actually, the mass doesn't matter in this case.
If you must raise the height of the ball a distance H, then its iniital kinetic energy must be M g H, the potential energy increase at the top of the trajectory. The M will cancel out

V^2 = 2 g H