JAMB Physics 2014 Objective — Question 12
Question 12 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2014 Objective paper, with the correct answer and a full explanation.
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An object of mass 20kg is released from a height of 10m above the ground level. The kinetic energy of the object just before it hits the ground is [g=10ms⁻²]
- A. 4000J
- B. 2000JCorrect
- C. 500J
- D. 200J
Explanation
U=0, a=10ms⁻², S=10m. V²=U²+2aS=0+2×10×10=200. K.E=½MV²=½×20×200=2000J (also obtainable via conservation of energy: K.E=P.E=mgh=20×10×10=2000J).
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