AP Physics 1hardmcq1 pt
A 4.0 kg cart moving at 6.0 m/s hits a stationary 2.0 kg cart and they stick. The fraction of initial kinetic energy lost is
A.1/3
B.1/2
C.2/3
D.1/4
Explanation
Core Concept
vf = 24/6 = 4.0 m/s. Kᵢ = 72 J, Kf = ½(6)(16) = 48 J, so the lost fraction is 24/72 = 1/3.
Correct Answer
A1/3
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