Answers

2016-01-03T18:13:23+05:30
It is negative work done because the displacement is in the opp. direction to the force applied.Negative work is done when a weight lifter lifts a body up and the force of gravity is in the downward direction.In the tug of war,acc. to the losing team negative work is done as displacement is opp. to the applied force.
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2016-01-05T15:20:58+05:30
Negative. since we know that w=F. S=FScos(angle between force and displasement). if force retards. then the angle between F, S is 180 then F. S is negative. so w is negative
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