AP Physics 1hardmcq1 pt
A 2.0 kg mass moving at 4.0 m/s strikes a 6.0 kg mass at rest and sticks. The kinetic energy lost is
A.12 J
B.16 J
C.4.0 J
D.8.0 J
Explanation
Core Concept
vf = 8/8 = 1.0 m/s. Kᵢ = 16 J; Kf = ½(8)(1) = 4 J; lost = 12 J.
Correct Answer
A12 J
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