Question

when does work said to be positive explain with the help of example?

Answer 1

POSITIVE WORK :the work done on an object is said to be positive work when force and displacement are in same direction.
example: When an object moves on horizontal surface,force and displacement acts in forward direction. So,work done is positive.

Answer 2

the work done is said to be (+)ve if displacement is in the direction of force
for example we take some luggage and go to on stairs like that in photo