Gravitational force

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) By 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?

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