Post-UTME Physics 2010 Objective — Question 7
Question 7 of 10 from the Post-UTME Screening (Post-UTME) Physics 2010 Objective paper, with the correct answer and a full explanation.
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A ball of mass 0.5kg moving at 10ms⁻¹ collides with another ball of equal mass at rest. If the two balls move together after the impact, calculate their common velocity.
- A. 0.2ms⁻¹
- B. 0.5ms⁻¹
- C. 5.0ms⁻¹Correct
- D. 10.0ms⁻¹
Explanation
This is a perfectly inelastic collision: v=(m1u1+m2u2)/(m1+m2)=(0.5×10+0.5×0)/(0.5+0.5)=5m/s.
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