A-LevelPhysicsDynamics9702/12 · Oct/Nov 2012 · Q131 Mark
Two identical, perfectly elastic spheres have the same mass m. They travel towards each other with the same speed v along a horizontal frictionless surface. [Figure showing two spheres colliding] Which statement about the sum of the kinetic energies of the spheres is correct?
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AThe sum of their kinetic energies before impact is zero.
BThe sum of their kinetic energies before impact is ½ mv².
CThe sum of their kinetic energies after impact is zero.
DThe sum of their kinetic energies after impact is mv².
✓ Correct answer
D: The sum of their kinetic energies after impact is mv².
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