A rock is dropped from rest from a cliff above the ground

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Work Energy and Power · Work Energy and Power

Problem

A 0.50 kg0.50\,\text{kg} rock is dropped from rest from a cliff 4.0 m4.0\,\text{m} above the ground. Neglect air resistance. What is the speed of the rock just before it strikes the ground? (a) 9.8 m ⁣⋅ ⁣s−19.8\,\text{m}\!\cdot\!\text{s}^{-1} (b) 6.3 m ⁣⋅ ⁣s−16.3\,\text{m}\!\cdot\!\text{s}^{-1} (c) 8.9 m ⁣⋅ ⁣s−18.9\,\text{m}\!\cdot\!\text{s}^{-1} (d) 19.6 m ⁣⋅ ⁣s−119.6\,\text{m}\!\cdot\!\text{s}^{-1}

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