Apentix/AP Physics 1/Unit 5: Momentum/Question
AP Physics 1mediummcq1 pt

A 0.5 kg ball moving at 10 m/s collides with a stationary 2.0 kg ball. After the collision, the 0.5 kg ball rebounds with a speed of 4 m/s. What is the velocity of the 2.0 kg ball after the collision?

A.A) 3.5 m/s
B.B) 7.0 m/s
C.D) 28.0 m/s
D.C) 14.0 m/s

Explanation

Core Concept

Using conservation of momentum: m1v1i + m2v2i = m1v1f + m2v2f. (0.5)(10) + (2.0)(0) = (0.5)(-4) + (2.0)v2f. 5 = -2 + 2v2f. 7 = 2v2f. v2f = 3.5 m/s.

Correct Answer

AA) 3.5 m/s

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