Suppose the universe were completely empt except for one object a solid sphere moving through space at a speed of 100 lms what sort of path would the object be moving in

Since, there is no net force of attraction or repulsion present between the object and any other celestial entity in the given space, we will get a more interrupted motion of the objects which are supposed to be all alone in the region or space.So, F(gravity)= zero(0) then we can say that there will be an uninterrupted motion of the object on a given multi-directional orientation. Just because from the point of its initiation to the point of an unknown destination, the over all motion of the celestial object would be multi-directional in nature with out being a curve or any other form of alignment due to the absence of an acting force inside the region.

Not sure what you mean by this question