Physics Work & Energy PMDC 2021
PMDC Verified Question 66 of 108
If a body of mass of 2 kg is raised vertically through 2m, then the work done will be
A
38.2 J
B
392.1 J
C
39.2 J
D
3.92 J
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: 39.2 J
Concept:

Work done to lift a body vertically against gravity is stored as gravitational potential energy.

Formula:

$$ W = mgh $$

Solution:

  • Mass (\( m \)) = 2 kg


  • Height (\( h \)) = 2 m


  • Acceleration due to gravity (\( g \)) = \( 9.8 \text{ m/s}^2 \)


  • \( W = 2 \times 9.8 \times 2 = 4 \times 9.8 = 39.2 \text{ J} \)


Why other options are incorrect:

Using \( g=10 \) gives 40 J. Misplacing decimal points during calculation yields 392.1 or 3.92.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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