Calculate the change in momentum of a 10kg object that has an initial speed of 15m/s and slows to 8 m/s. If
this change occurs over a time of 3s, what force caused the change?

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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