Energy Conservation With Nonconservative Forces: A 30-N stone is dropped from a height of 10 m and strikes the ground with a speed of 13 m/s. What average force of air friction acted on the stone as it fell?
A. 4.1 N
B. 2.9 N
C. 0.13 kN
D. 7.2 N
E. 1.2 N
Answer: A
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