AP Physics 1hardmcq1 pt
A 2.0 kg ball thrown up at 10 m/s reaches a height of 4.0 m. The work done by air resistance is (g = 10 m/s²)
A.-20 J
B.20 J
C.-80 J
D.0 J
Explanation
Core Concept
Initial K = 100 J; final U = 80 J; the 20 J difference is removed by drag (negative work).
Correct Answer
A-20 J
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