A 30-Kg Mass Is Dropped from the Edge of a 50-M

Multiple Choice

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. Find the change in mechanical energy of the mass caused 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