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Newton's Law of Motion - sliding down a slope

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A 20-kg child sits on a 5-kg sled and slides down a 125-meter, 31-degree slope, to the nearest m/s what is his or her speed at the bottom?

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Solution Summary

The solution gives all mathematical steps. Newton's law of motion for sliding down a slope is determined.

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The total mass of the child + sled = 25 Kg, we will consider this as a single mass. The only force acting on the mass when it is at the top of the slope is the force due to gravity which is equal to

F = mg

This acts vertically downwards.

But ...

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