Balanced forces acting on an object keeps it at or moving at in straight line. Fill in the ___ spaces

Please see below as the answer is self explanatory.

Explanation:

According to Newton's 2nd law,  a net force acting on an object of mass m, causes the object to be accelerated.If the forces acting on the object are balanced, which means that the net force on the object is zero, just applying the same law, we find that the object is not accelerated.According to Newton's First law, an object that is not accelerated is at rest, or moves along a straight line at constant speed.So, if there are balanced forces acting on the object, if the object is at rest, will keep at rest, and if it is moving, it will keep moving at constant speed along a straight line.

10 neutrons is the answer

26.4 is about the right time