Physics Work & Energy MDCAT 2009
PMDC Verified Question 105 of 108
If a certain force acts on an object and changes its kinetic energy from 65 J to 130 J, then work done by the force will be:
A
92.5 J
B
65 J
C
97.5 J
D
130 J
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: 65 J
Concept:

According to the Work-Energy Principle, the net work done on an object is strictly equal to the change in its kinetic energy.

Formula:

$$ W = \Delta K.E = K.E_f - K.E_i $$

Solution:

  • Final Kinetic Energy (\( K.E_f \)) = 130 J


  • Initial Kinetic Energy (\( K.E_i \)) = 65 J


  • \( W = 130 \text{ J} - 65 \text{ J} = 65 \text{ J} \)


Why other options are incorrect:

Option D represents only the final kinetic energy. Options A and C result from arbitrary arithmetic (like taking averages) rather than applying the direct difference.

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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