Statement (A): Work done by a man in lifting a bucket out of well, by means of a rope tied to the bucket, is positive. Statement (B): In the above case, work done by the gravitational force is negative.
A
Both A and B are true
B
Both A and B are false
C
A is true and B is false
D
A is false and B is true
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Solution
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A- Point of application of force is moving along the direction of applied force. Therefore, work done by man on the bucket is positive.
B- Displacement of bucket is opposite to the gravitational force, therefore negative work is done.
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