Answers

2015-11-16T17:22:26+05:30
Hi there,
work done by a force is said to be negative when the displacement is against the directing of the force acting on the object.in this case the angle b/w displacement and force is 18 degree. 
i hope this helps u...
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2015-11-16T17:26:35+05:30
work done is said to be negative when displacement is in opposite direction to the force applied . 
 i hope that this will help u ...........................^_^
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