# physics

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A 30 kg child slides down a playground slide at a constant speed. The slide has a height of 3.8m and is 7.8m long. using energy considerations, find the magnitude of the kinetic friction force acting on the child.

• physics -

Since the KE does not change, the work done by gravity equals that done by friction. Thus the friction force times the distance slid equals the change in potential energy m g h

m g h = F * 7.8

• physics -

2293.2

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