A boy raises an object of mass 10Kg vertically above his head through a height of 5m. The potential energy stored in the body is:_
Correct answer: C. 490 J
- A. 98 J
- B. 49J
- C. 490 J
- D. 980 J
Explanation
The potential energy (PE) stored in an object is calculated as:PE = m × g × hwhere:m = mass of the object (10 kg)g = acceleration due to gravity (approximately 9.8 m/s²)h = height through which the object is raised (5 m)Substituting the values, we get:PE = 10 kg × 9.8 m/s² × 5 m= 490 J
This question appeared on the KMU MDCAT 2023 (retake) paper, which you can sit online with every answer explained.
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About Potential Energy
Potential energy is energy stored because of position or configuration, including gravitational potential energy near Earth's surface and elastic energy in a stretched or compressed spring. Questions use changes in potential energy and conservation of mechanical energy, while distinguishing a chosen reference level from an absolute zero of energy.
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