Question

A train is moving at constant speed over a certain period of time. Which of the following statements about the train's motion during this period of time must be false?A. The magnitude of the train's velocity is constant.B. The distance traveled by the train will be a positive, nonzero number.C. The train's direction of motion may change.D. The instantaneous speed may be higher or lower than the average speed.

Answer 1

The train is moving with the constant speed, so the distance traveled by the train is constant. Thus, the second option can be true.

By changing the direction of motion the speed does not change. Thus, the third option can be true.

The magnitude of the velocity is the speed. As the speed given is constant. So the first option is also correct.

As the train is moving with constant speed. So, the instantaneous speed has to be constant too. Its value should be same as the average value of speed of the train.

Thus, the fourth option is false.

Hence, fourth option is the