AP Physics 1hardmcq1 pt
An 800 kg car coasts up a hill, rising 5.0 m and slowing from 20 m/s to 10 m/s (g = 10 m/s²). The energy lost to friction and drag is
A.80000 J
B.120000 J
C.40000 J
D.160000 J
Explanation
Core Concept
ΔK = ½(800)(400 − 100) = 120000 J; ΔU = (800)(10)(5) = 40000 J; lost = 120000 − 40000 = 80000 J.
Correct Answer
A80000 J
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