Justify giving proper reasoning whether the work done in the following case is positive or negative: Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket.

(POSITIVE) The work done is positive. This is because the man applies a force in the upward direction to lift the bucket,and the displacement of the bucket also occurs in the same upward direction. Since the angle between the force vector and the displacement vector is $0^{\circ}$,the work done $(W = F \cdot s \cdot \cos(0^{\circ}))$ is positive.