Physics Force & Motion NUMS 2022
PMDC Verified Question 86 of 137
An elastic collision is the one in which:
A
Kinetic energy and momentum is conserved
B
Kinetic is conserved but total energy is not conserved
C
Momentum is conserved but kinetic energy is not conserved
D
Both kinetic energy and momentum are not conserved
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Kinetic energy and momentum is conserved
Concept:

Collisions in isolated systems always conserve linear momentum. How they handle kinetic energy dictates their specific classification.

Solution:

  • By universal law, total momentum is conserved in all types of collisions.


  • An "elastic" collision is strictly defined as a perfect bounce where absolutely zero macroscopic kinetic energy is converted into heat, sound, or permanent deformation.


  • Therefore, both kinetic energy and momentum remain exactly equal before and after the impact.


Why other options are incorrect:

Option C defines an inelastic collision. Option B violates the fundamental First Law of Thermodynamics (total energy is always conserved universally). Option D violates basic momentum conservation.

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