Respuesta :

C. inertia

inertia is the factor that makes the train hard to stop taking a long time to completely come to a stop

Answer:

Intertia

Explanation:

Interia is like a property in whichit continues in its existing state of (rest or uniform motion ) in a straight line, unless that state is changed by an external force.

But

Balanced forces is just when two  forces act on an onject       and the net force is zero. Inshort it doesnt hve any affect on the object.

Unbalanced forces is just when two  forces act on an onject       and the net force is NOT zero. Inshort it does hve any affect on the object.

I hope im right