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

A 0.01 kg bullet is fired into a 2 kg wooden block initially at rest. The bullet embeds itself in the block, and the combination moves with a speed of 1.2 m/s. What was the initial speed of the bullet?

A.120 m/s
B.240 m/s
C.360 m/s
D.480 m/s

Explanation

Core Concept

Using conservation of momentum: m1v1i + m2v2i = (m1 + m2)v. (0.01)v + (2)(0) = (0.01 + 2)(1.2). 0.01v = 2.01 × 1.2. 0.01v = 2.412. v = 241.2 m/s, which rounds to 240 m/s.

Correct Answer

B240 m/s

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