A 2.0-kg mass is projected vertically upward from ground level with an initial speed of 30 m/s. The mass rises to a maximum height of 35 m above ground level. What is the change in mechanical energy of the mass caused by air resistance between the point of projection and the point of maximum height?
A. ?0.21 kJ
B. ?0.47 kJ
C. ?0.40 kJ
D. ?0.34 kJ
E. ?0.69 kJ
Answer: A
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