Apentix/AP Physics 1/Unit 5: Momentum/Question
AP Physics 1easymcq1 pt

A 1000 kg car moving at 20 m/s collides with a 3000 kg truck moving at 10 m/s in the same direction. After the collision, they stick together. What is their common velocity after the collision?

A.12.5 m/s
B.13.3 m/s
C.15.0 m/s
D.17.5 m/s

Explanation

Core Concept

Using conservation of momentum: m1v1i + m2v2i = (m1 + m2)v. (1000)(20) + (3000)(10) = (1000 + 3000)v. 20000 + 30000 = 4000v. 50000 = 4000v. v = 12.5 m/s.

Correct Answer

A12.5 m/s

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