According to Newton's law of inertia, a rail road 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. must go up and down hills.
C. are much too heavy.
D. always have forces that oppose their motion
Answer:D
According to Newton's law of inertia, a rail road 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. must go up and down hills. C. are much too heavy. D. always have forces that oppose their motion