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Per NCERT §5.11.2 eqn 5.26 / 5.27, in an ELASTIC 1D collision of m₁ (v₁) with m₂ (at rest), the final velocity v_{1f} is which?
A(m₁ − m₂)/(m₁ + m₂) × v₁
BZero (always stops)
Cv₁ unchanged always
D(m₂ − m₁)/(m₁ + m₂) × v₁
Answer & Solution
Correct answer: A. (m₁ − m₂)/(m₁ + m₂) × v₁
NCERT eqn 5.26: v_{1f} = (m₁−m₂)/(m₁+m₂) v₁. And v_{2f} = 2m₁ v₁ / (m₁+m₂).
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