A body of mass 4 kg is lifted to a height of 5 meters. What is the potential energy gained by the body? (Take \( g = 9.8 \, \text{m/s}^2 \))
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Gravitational potential energy is directly proportional to mass and height: \( PE = mgh \). Always use standard \( g = 9.8 \, \text{m/s}^2 \) unless mentioned otherwise.