Practice question
Question
A 45g bullet at 1100m/s emerges from a block with 50% of its initial kinetic energy. What is its emergent speed?
Explanation
Kinetic energy K=½mv² and potential U=mgh per NCERT. Energy conservation K+U=constant for conservative forces. Substituting m, v, h gives 778 m/s as energy, matching option B.
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