Question

Justify giving proper reasoning whether the work done in the following cases is positive or negative
a) Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket
b) Work done by gravitational force in the above case. ​

Answer 1

Answer:

Explanation:

(A) in first condition angle between the opposite forces is 180 so the work done is negative

In second condition work is positive because the both forces in same direction and angle between force is zero