Question

when is the work negative or positive or zero ? ~~

Answer 1

Negative :you are failed
positive :you are passed
zero:means your position is zero

Answer 2

negative:when force acts in oppostite direction like in spring the restoring force acts in opposite direction then work done is negative
zero:when no force is acting or no displacement is occuring like when you push a wall there's no displacement then work done is zero
positve:when force is acting and displacing some body like when you are driving a car force is acting and displacment is also there