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A body of mass 20 kg is lifted up by 10 m . calculate it's potential energy .lf this body is allowed to fall, find its kinetic energy

Answer»

al energy = mghTaking g as 10m/s²,So POTENTIAL energy = 20 × 10 × 10 => potential energy = 2000 Joules. We have to find its kinetic energy at the FINAL velocity. v² - u² = 2gh=> v² - 0 = 2× 10 × 10=> v² = 200Now kinetic energy = 1/2 × m × v²=> kinetic energy = 1/2 × 20 × 200=> kinetic energy = 2000 Joules



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