EasyPhysics
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-- Two balls collide head-on such that the coefficient of restitution is less than one. Which of the following is correct for the given collision?
A
Total kinetic energy increases after collision
B
Total energy increases after collision
C
Velocity of separation is less than velocity of approach
D
Both (2) and (3)
Explanation
For inelastic collisions (e < 1), e = (v_sep / v_app). If e < 1, then v_sep < v_app. Kinetic energy is always lost (converted to heat/sound), never increased.
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