6779
Physics Work,Power & Energy Level: Misc Level
A 3.0-kg mass is dropped from the edge of a 50-m tall building with an initial speed of zero. The mass strikes the ground with a downward velocity of 25 m/s.How much work is done on the mass by air resistance between the point where it is dropped and the point where it strikes the ground?
a. -0.46 kJ
b.-0.53 kJ
c.-0.61 kJ
d.-0.38 kJ
e.-0.81 kJ