Physics Work & Energy SZABMU 2024
PMDC Verified Question 5 of 108
The amount of work required to stop a moving object is equal to:
A
The velocity of the object
B
The change in kinetic energy of the object
C
The mass of the object times its acceleration
D
The mass of the object times its velocity
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: The change in kinetic energy of the object
Concept:

This is the fundamental definition of the Work-Energy Theorem.

Formula:

$$ W_{\text{net}} = \Delta K.E = K.E_f - K.E_i $$

Solution:

  • To stop an object, its final kinetic energy must become zero.


  • The work done against the object (negative work) removes its kinetic energy.


  • Therefore, the magnitude of work required is exactly equal to the object's total initial kinetic energy, which represents its change in kinetic energy.


Why other options are incorrect:

Mass \( \times \) acceleration is Force. Mass \( \times \) velocity is Momentum. Work is an energy measure, not a force or momentum measure.

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