The weight of a body is 120N and it is lifted to a height of 10m, work done on the body is:
Correct answer: D. 1200 J
- A. 120 J
- B. 100 J
- C. 1000 J
- D. 1200 J
Explanation
The work done on an object when it is lifted can be calculated using the formula: Work = Weight x Height. In this case, the weight of the body is 120N and it is lifted to a height of 10m. Plugging in the values:Work = 120N x 10m = 1200 J.Thus, the correct answer is 1200 J. The other options are incorrect because:120 J: This underestimates the work done as it does not use the correct height.100 J: This is significantly lower than the calculated work.1000 J: While closer, it still fails to multiply the weight and height correctly.Therefore, the correct answer is 1200 J.
This question appeared on the KMU MDCAT 2023 paper, which you can sit online with every answer explained.
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About Work
Work is done when a force produces displacement, with its value determined by the component of force along the displacement. The topic covers positive, negative and zero work, work by variable forces from force-displacement graphs, and the connection between net work and change in kinetic energy.
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