Answers

2015-10-28T09:59:10+05:30
Hi there,
everything in math has it s uses .
for example zero has many uses,it is used to represent nothingness.if there was not zero ,we would have used terms like 1-1 for representing nothing.
negative is used exams to make the competition tighter,without negative symbol we would have never been able to subtract!!!
positive numbers are used in so many places like it is used i valuing money,scores in games etc.
 i hope this helps u... 
0
2015-10-28T13:42:27+05:30
positive work =  when object's displacement occurs in the direction of force applied the work done is always positive.
negative work = when object's displacement occurs in the direction opposite to the force applied the work done is always negative.( frictional force and air resistance )
zero work done = when object's displacement occurs in perpendicular direction to the force applied then the work done is 0. ( force of gravity)
        i hope that this will help u........................^_^
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