Physics Force & Motion MDCAT 2019
PMDC Verified Question 112 of 137
If two objects of equal masses 'm' are moving towards each other with the same speeds 'v' then what will be the total final momentum after elastic head-on collision?
A
\( -mv \text{ kg/s} \)
B
\( 2 mv \text{ kg/s} \)
C
\( mv \text{ kg m/s} \)
D
\( 0 \text{ kg m/s} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: \( 0 \text{ kg m/s} \)
Concept:

Conservation of vector momentum.

Solution:

  • Total initial \( P = mv - mv = 0 \). Thus final is 0.


Why other options are incorrect:

Adding magnitudes ignores vector nature.

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