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A bullet of mass 50 g is fired with a speed 100 m/s on a plywood and emerges with 40 m/s. The percentage loss of kinetic energy is

Asked in JEE Main 6th April 1st Shift 2024 · Applying the work-energy theorem

• (1) 32%
• (2) 84%
• (3) 16%
• (4) 44%

Step-by-step solution

Why the other options are wrong

• (1) No single slip gives 32%. Sanity check: the speed drops to 40% so the kinetic energy drops to 16%, a loss of 84%.
• (3) Comes from reporting the remaining fraction instead of the loss.
• (4) No single slip gives 44%. Sanity check: even the speed alone falls by 60%, and the energy falls faster than the speed.

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