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A child slides down a snow‑covered slope on a sled. At the top of the slope,...

A child slides down a snow‑covered slope on a sled. At the top of the slope, her mother gives her a push to start her off with a speed of 0.70 m/s. The frictional force acting on the sled is one‑fifth of the combined weight of the child and the sled. If she travels for a distance of 24.5 m and her speed at the bottom is 4.25 m/s, calculate the angle that the slope makes with the horizontal.

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