WAEC Physics 2020 Objective — Question 44
Question 44 of 50 from the West African Examinations Council (WAEC) Physics 2020 Objective paper, with the correct answer and a full explanation.
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A diver steps off a diving platform 10 m above the water. If there is no air resistance during the fall, there will be a decrease in the diver's
- A. gravitational potential energyCorrect
- B. total mechanical energy
- C. kinetic energy
- D. momentum
Explanation
At the top of the diving platform, the total energy = gravitational potential energy = mgh (since the diver is at height h above the water). As the diver falls, the gravitational potential energy decreases as the height of fall decreases, being converted to kinetic energy; total mechanical energy remains conserved (no air resistance).
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