A ball of mass is released from rest at a height of above the ground

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

Problem

A ball of mass 0.5 kg0.5\,\text{kg} is released from rest at a height of 8 m8\,\text{m} above the ground. Take g=10 m/s2g = 10\,\text{m/s}^2. Find its speed when its potential energy has decreased by 20 J20\,\text{J}. (a) 12.6 m/s12.6\,\text{m/s} (b) 8.9 m/s8.9\,\text{m/s} (c) 6.3 m/s6.3\,\text{m/s} (d) 4.5 m/s4.5\,\text{m/s}

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