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A person pushing a uniformly‑loaded 46.2 kg46.2 kg wheelbarrow of length ?L with pushing force ?⃗...

A person pushing a uniformly‑loaded 46.2 kg46.2 kg wheelbarrow of length ?L with pushing force ?⃗ P→ is attempting to get it over a step. The maximum horizontal force that the person can apply is ??=681 N.Px=681 N. What is the maximum height ℎh of the step, expressed as a fraction ?n of the wheel's radius ?R, that the person can get the wheelbarrow over?

The gravitational acceleration is ?=9.81 m/s2.

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