Post-UTME Physics 2011 Objective — Question 7
Question 7 of 10 from the Post-UTME Screening (Post-UTME) Physics 2011 Objective paper, with the correct answer and a full explanation.
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A body of mass 100g moving at a velocity of 10.0ms⁻¹ collides with a wall. If after the collision it moves with a velocity of 2.0ms⁻¹ in the opposite direction, calculate the change in momentum.
- A. 0.8Ns
- B. 1.2NsCorrect
- C. 12.0Ns
- D. 80.0Ns
Explanation
Initial momentum=0.1×10=1Ns; final momentum=0.1×(-2)=-0.2Ns. Change=|-0.2-1|=1.2Ns.
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