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Question

A 20g bullet at 1000m/s emerges from a block with 70% of its initial kinetic energy. What is its emergent speed?

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 837 m/s as energy, matching option B.