JAMB Physics 2011 Objective — Question 1
Question 1 of 49 from the Joint Admissions and Matriculation Board (JAMB) Physics 2011 Objective paper, with the correct answer and a full explanation.
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A carpenter on top of a roof 20.0 m high dropped a hammer of mass 1.5kg and it fell freely to the ground. The kinetic energy of the hammer just before hitting the ground is [g = 10 ms⁻²]
- A. A. 300 JCorrect
- B. B. 450 J
- C. C. 600J
- D. D. 150J
Explanation
The potential energy at the top of the roof converts entirely to kinetic energy just before hitting the ground: K.E. = P.E.(max) = mgh = 1.5x10x20 = 300J.
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