Answer to Question #16154 in Mechanics | Relativity for Amber rojas
P = 22[kg]*9.8[m/s²]*4.5[m] = 970.2 J.
When the child slides down, its potential energy turns into kinetic energy:
P = K = 22[kg]*(V[m/s])²/2 = 970.2 J.
V = √(970.2*2/22)[m/s] ≈ 9.39 [m/s].
So, the velocity of a child will be about 9.39 [m/s].
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