Answer:
5.9 kg
Explanation:
The weight of an object is given by:
[tex]W=mg[/tex]
where
m is the mass of the object
g = 9.8 m/s^2 is the gravitational acceleration
In this problem, we have a box with a weight of W = 58 N. Therefore, we can re-arrange the equation above using this number to find m, the mass of the box:
[tex]m=\frac{W}{g}=\frac{58 N}{9.8 m/s^2}=5.9 kg[/tex]
The fact the box is on an inclined plane is totally irrelevant for the resolution of the problem.
