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

AP Physics 1mediummcq1 pt

A stationary 4.0 kg object explodes into two pieces of 1.0 kg and 3.0 kg. If the 1.0 kg piece flies off at 12 m/s, the 3.0 kg piece moves at

A.4.0 m/s in the opposite direction

B.4.0 m/s in the same direction

C.12 m/s in the opposite direction

D.36 m/s in the opposite direction

Explanation

Core Concept

Momentum starts at zero: 0 = (1.0)(12) + (3.0)v, so v = −4.0 m/s.

Correct Answer

A4.0 m/s in the opposite direction

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