According to Newton's law of inertia,a railroad train in motion should continue going forever even if its engine is turned off.We never observe this because railroad trains
A)move too slowly.
B)are much too heavy.
C)must go up and down hills.
D)always have forces that oppose their motion.

Question

Quizplus · Accepted Answer

Newton's law of inertia states that an object in motion will stay in motion with a constant velocity unless acted upon by an external force. In the case of a railroad train, there are always opposing forces that act upon it such as friction, air resistance, and gravity. These forces eventually bring the train to a stop, rather than allowing it to continue moving forever.

According to Newton's Law of Inertia,a Railroad Train in Motion