Question 1

Momentum will be conserved in a two-body collision only if

• A.     both bodies come to rest.
• B.     the collision is perfectly elastic.
• C.     the kinetic energy of the system is conserved.
• D.     the net external force on the two-body system is zero.
• E.     the internal forces of the two body system cancel in action-reaction pairs.

Formula Sheet

Question 2

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