Suppose that you slowly lift a pail from the ground to a distance of 1.5 meters above the ground. The pail weighs 100N. How much work is done by the force which you exert on the pail?
(A) 100Nm.
(B) 150Nm.
(C) -100Nm.
(D) -150Nm.
Questions
--- 
What this question is about
(A) 100Nm. --- No.
Multiply by the distance traveled.
Questions
--- What this question is about
(B) 150Nm. --- Yes.
Work = (100N)(1.5m) = 150Nm
Questions
--- What this question is about
(C) -100Nm. --- No. Work is positive when
force and distance are in the same direction.
Questions
--- What this question is about
(D) -150Nm. --- No. Work is positive when
force and distance are in the same direction.
Questions
--- What this question is about