A man of mass 56kg moving at a constant speed 30km/s.then the work done by the man is?
Answers
The net work done is zero
Explanation:
An object moving at a constant speed is doing no work.
This is due to the fact that, if we see the formulas of work. It is evident that
Work = force * distance
If the speed of object is constant, there will be no change in the acceleration and if the acceleration is not changing there is no change in the force applied on the object. Thus, the work done by the object is zero.
work done by the man is Zero if man is moving at Constant speed
Explanation:
Work Done = Change in Energy
The change in the Energy of an object is equal to the net work done on the object.
Here Energy = Kinetic Energy = (1/2)mv²
Man is running with constant speed
Hence v is constant
hence (1/2)mv² = Kinetic Energy is constant
So there is no change in Energy
Hence Work Done = 0
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