A 63 kg child descends a slide 7.6 m high and reaches the bottom with a speed of 3.20 m/s. How much thermal energy (in joules) due to friction was generated in this process?

Answer 1

PE = M*g * h = 63*9.8 * 7.6 = 4692 J.

KE = 0.5M*V^2 = 0.5 * 63 * 3.2^2 = 323 J.

4692 - 323 = 4369 J. loss.