work is warship
Classical Mechanics
Level
2
A coolie holding a 25kg bag on his head walks 100m along a straght path. Calculate the work done by coolie.
The answer is 0.
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Since the 25kg bag is accelerated downwards due to gravity and the coolie moves along (the tangent of) the earth surface. The downward mass and the acceleration of coolie are at right angle to each other.As F=macosA = macos90=0.