JEE Mains · Physics · STD 11 - 5. work,energy,power and collision
A bullet of mass \(50 \mathrm{~g}\) is fired with a speed \(100 \mathrm{~m} / \mathrm{s}\) on a plywood and emerges with \(40 \mathrm{~m} / \mathrm{s}\). The percentage loss of kinetic energy is _______.
- A \(32 \%\)
- B \(44 \%\)
- C \(16 \%\)
- D \(84 \%\)
Answer & Solution
Correct Answer
(D) \(84 \%\)
Step-by-step Solution
Detailed explanation
\(\mathrm{K}_{\mathrm{i}} =\frac{1}{2} \mathrm{~m}(100)^2\) \(\mathrm{~K}_{\mathrm{f}} =\frac{1}{2} \mathrm{~m}(40)^2\) \(\% \text { loss }=\frac{\left|\mathrm{K}_{\mathrm{f}}-\mathrm{K}_{\mathrm{i}}\right|}{\mathrm{K}_{\mathrm{i}}} \times 100\)…
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