A 1.50 kg snowball is fired from a cliff 13.5 m high. The snowball's initial velocity of 14.0 m/s, directed 41.0° above the horizontal.
(a) How much work is done on the snowball by its weight during its flight to the ground below the cliff?
1 J
(b) What is the change in the gravitational potential energy of the snowball-Earth system during the flight?
2 J
(c) If that gravitational potential energy is taken to be zero at the height of the cliff, what is its value when the snowball reaches the ground?
3 J

Please tell me this isn't a homework question.