Conservation of Mechanical Energy — JEE Main Physics MCQs with Solutions
Free JEE Main Physics Conservation of Mechanical Energy MCQs with step-by-step solutions (2 questions). Part of Work, Power and Energy. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Conservation of Mechanical Energy · easy · numerical
A child starts from rest at the top of a smooth slide of height 3.2 m. Her speed at the bottom is:
A. 16 m/s
B. 8 m/s ✓ Correct
C. 4 m/s
D. 5.7 m/s
Solution: v = √(2gh) = √(2×10×3.2) = √64 = 8 m/s.
Q2 — Conservation of Mechanical Energy · medium · numerical
A 0.1 kg ball dropped from 10 m rebounds to 5 m. The energy lost in the bounce is:
A. 0.5 J
B. 5 J ✓ Correct
C. 10 J
D. 2.5 J
Solution: Loss = mg(h₁ − h₂) = 0.1×10×5 = 5 J (50% of the initial energy).