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Question

A 0.9kg object is dropped from 20m. What is its kinetic energy just before impact? (Take g\=10m/s2)

Options

Choose one · Correct answer highlighted

Explanation

Kinetic energy K=½mv² and potential U=mgh per NCERT. Energy conservation K+U=constant for conservative forces. Substituting m, v, h gives 180 J as energy, matching option B.

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