Thu October 25, 2012 By:

answer the following questions-

Expert Reply
Thu October 25, 2012
when the distance travelled is in the direction of force applied then the work done is positive and when it is in the opposite direction it is negative and when perpendicular it is zero.
thus for positve work done: eg. a box sliding down or falling down.
negative work done: deccelerating motion
zero work done: a body moving perpendicular to gravity
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