Physics Force & Motion SZABMU 2022
PMDC Verified Question 60 of 137
Two balls collide each-other, it has been observed that be collision is elastic. Which statement advocates the observation?
A
K.E before collision = K.E after collision
B
Momentum before collision = Momentum after collision
C
K.E before collision \( \neq \) K.E after collision
D
Momentum before collision \( \neq \) momentum after collision
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: K.E before collision = K.E after collision
Concept:

Definition of elastic.

Solution:

  • Strict conservation of Kinetic Energy defines elastic collisions.


Why other options are incorrect:

Momentum is conserved in ALL collisions, so it doesn't uniquely identify an elastic one.

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