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A 1.50 kg snowball is fired from a cliff 13.0 m high with an initial velocity of 14.0 m/s, directed 41.0° above the horizontal.
(a) What is the change in the gravitational potential energy of the snowball-Earth system during the flight?
__ J
(b) 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?
(c) Find the speed of the snowball just before it hits the ground at the bottom of the cliff.
__ m/s
(d) Repeat part (c) if the initial velocity makes an angle of 20o with the horizontal..
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