A cart (mass = 2.7 kg) is pushed and held against a spring such that the spring stores 62.6 joules of energy. Use conservation of energy to determine the speed that the spring can impart to the cart when the cart is released.

490 n  f=125n a=2.5m/s2

At maximum height, kinetic energy is converted in potential energy  formula: at max height, ke = ½ * 0.27kg * (16m/s) ² = 34.56 j  so the remaining pe = (41.70 – 34.56)= 7.14 j = 0.27 kg * 9.8m/s² * h  = (9.8/7.14 * 0.27)so max height h = 5.08 or 5 m