Sphere A (mass m) moving at speed 4u collides elastically with sphere B (mass 2m) moving at speed u in the same direction. What is meant by an elastic collision?

Model answer

kinetic energy is conserved

Also accepted: KE is conserved, no kinetic energy lost

Explanation: In an elastic collision, kinetic energy is conserved as well as momentum, unlike an inelastic collision where some kinetic energy is lost.

Derived from ZIMSEC Physics Paper 3, November 2002, Q1

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Sphere A (mass m) moving at speed 4u collides elastically with sphere B (mass 2m) moving at speed u in the same direction. What is meant by an elastic collision?

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