Here we will use conservation of energy to tackle a simple free-fall problem. You throw a 0.150 kg baseball straight up in the air, giving it an animal upward velocity of magnitude 20.0 m/s. Use conservation of energy to find how high it goes, ignoring air resistance. You throw the same baseball up from the surface of Mars (where the acceleration due to gravity is 3.71 m/s^2) with the same speed as before. Find how high the ball goes.