A25 n object is 3 meters up. how much potential energy does it have. notice the units oft-he object

            Potential Energy = (mass) x (gravity) x (height).

But (mass) x (gravity) is 'weight', so

             Potential Energy =      (weight)          x (height) .

The question says that the object is 25 N .
The ' N '  stands for ' Newton ' and that's a unit of force,
so we know that this is the weight of the object.

              Potential Energy  =  (25 N)  x  (3 meters)

                                          =       75  Newton-meters

                                          =       75 Joules .