For an apple with mass m = 0.1 kg hanging at a height h = 2.5 m, the gravitational potential energy is E = 2.4525 J, or roughly half a calorie. To find this result, multiply m by h and by g, with g = 9.81 m/s²:
E = 0.1 kg · 2.5 m · 0.81 m/s² = 2.4525 J. Read more