WAEC Physics 2023 Objective — Question 34
Question 34 of 50 from the West African Examinations Council (WAEC) Physics 2023 Objective paper, with the correct answer and a full explanation.
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A lead bullet of mass 0.05 kg is fired with a speed of 200 ms⁻¹ into a lead block of mass 0.95 kg at rest. Given that the lead block moves after the impact, determine its kinetic energy.
- A. 50 JCorrect
- B. 100 J
- C. 150 J
- D. 200 J
Explanation
By conservation of linear momentum: v=(0.05×200)/(0.05+0.95)=10/1=10 ms⁻¹. KE of the block after collision = ½×0.95×10² = 47.5 J, closest to option A (50 J).
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