WBJEE · Physics · Center of Mass Momentum and Collision
If the kinetic energy of a body changes by \(20 \%\) then its momentum would change by -
- A \(20 \%\)
- B \(24 \%\)
- C \(40 \%\)
- D None of the above
Answer & Solution
Correct Answer
(D) None of the above
Step-by-step Solution
Detailed explanation
\(\frac{\frac{p_f^2}{2 m}-\frac{p_i^2}{2 m}}{\frac{p_i^2}{2 m}} \times 100=20\) \(\Rightarrow \frac{p_f}{p_i}=\sqrt{1.2}=1.095 \Rightarrow \frac{p_f-p_i}{p_i}=0.095\) Therefore \(\%\) increase \(=9.5 \%\)
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