A 1.50 kg snowball is shot upward at an angle of 34.0o to the horizontal with an

Question:

A 1.50 kg snowball is shot upward at an angle of 34.0o to the horizontal with an initial speed of 20.0 m/s.
(a) What is its initial kinetic energy?
(b) BV how much does the gravitational potential energy of the snowball-Earth system change as the snowball moves from the launch point to the point of maximum height?
(c) What is that maximum height?