Two forces are exerted on an object in a vertical direction: a 20n force downwards, and 10 n force upwards. the mass of the object is 25kg. what is the net force expression? worth 30 ! me plz.

When you add up (20N down) and (10N up), 
you get a sum of (10N down).

The mass of the object has no effect on the forces.

Now ... I see 5 points for the answer.
Where are the other 25 coming from ?

Show him another sport or something

Iassume the answer is 75 feet. inwards to outwards rather than outwards to inwards. probably be 75.hachures are stokes drawn in direction of the steepest slope. a series of short parallel lines drawn on a map to indicate topographic relief. it is actually called hachures on contour lines. the small marks in the center of the feature are called hachures.observe the picture attached