How much work is done against the gravitational force on a 3.0 kg object when
PHYSICS
JAMB 2023
How much work is done against the gravitational force on a 3.0 kg object when it is carried from the ground floor to the roof of a building, a vertical climb of 240 m?
- A. 7.2 kJ
- B. 4.6 kJ
- C. 6.8 kJ
- D. 8.4 kJ
Correct Answer: A. 7.2 kJ
Explanation
The work done against the gravitational force is calculated using the formula W = mgh, where m is the mass of the object, g is the acceleration due to gravity (approximately \(9.8 ms^2\) on Earth), and h is the height. Substituting the given values, we get W = 3.0 kg * \(9.8 m/s^2\) * 240 m = 7.2 kJ. Therefore, the correct answer is '7.2 kJ'.
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