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Asked by Abhay Last Modified
Answer 
Dharmendra Kumar
A teacher's purpose is not to create students in this own image, but to develop students who creates their own image.
A) positive
In a given case, force and displacement are in the same direction. Hence the sign of work done is positive. In this case the work is done on bucket.
(b) negative
In this case, the direction of force and displacement are opposite to each other. Hence, the sign of work done is negative.
(c) negative
Since the direction of frictional force is opposite to the direction of motion, the work done by frictional force in negative.
(d) positive
Here the body is moving on a rough horizontal plane. Frictional force oppose the motion body. Therefor in order to mention a uniform velocity a uniform force must be apply to body. Since the applied force at in the direction of motion of the body the work down is positive.
(e) - Negative
The resistive force of air act in the direction opposite to the direction of motion of pendulum. Hence the work done is negative.
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