A 1.70 kg snowball is fired from a cliff 11.5 m high with an initial velocity of 15.8 m/s, directed 49.0 above the horizontal. (a) Using energy techniques, find the speed of the snowball as it reaches the ground below the cliff. What is that speed (b) if the launch angle is changed to 49.0" below the horizontal and (c) if the mass is changed to 4.80 kg? (a) Number Units (b) Number Units v (c) Number Units