A Puck with a Mass $m _ { 1 } = 50 \mathrm {~g}$

question 72

Multiple Choice

A puck with a mass $m _ { 1 } = 50 \mathrm {~g}$ moving at 1.0 m/s approaches a stationary puck with a mass $m _ { 2 } =$
100 g on a frictionless air table, and they undergo a sudden two-dimensional elastic collision. After
the collision, both pucks have identical speeds, but travel in different directions. What is the angle
between the original and final paths of puck with mass $m _ { 1 } ?$

• A) \(150 ^ { \circ }\)
• B) \(30 ^ { \circ }\)
• C) \(90 ^ { \circ }\)
• D) \(60 ^ { \circ }\)
• E) \(120 ^ { \circ }\)

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