Question

question 10 (1 point) you are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly toward the back of the train. from this observation, you can conclude that this train is ______. a) slowing down b) speeding up c) moving with a constant velocity d) changing direction e) slowing down and changing direction f) speeding up and changing direction

Explanation:

To solve this, we use the concept of inertia (Newton's first law). The luggage has a certain velocity. When the train speeds up, the train's velocity increases, but the luggage, due to inertia, tends to maintain its original velocity. So relative to the train (which is now faster), the luggage slides backward.

• Option a: If the train slows down, the luggage would slide forward (since it wants to keep moving at the original speed), so a is wrong.
• Option b: As explained, when the train speeds up, the luggage lags behind (slides back) due to inertia. This matches.
• Option c: If velocity is constant, the luggage would move with the train, no sliding. So c is wrong.
• Option d: Changing direction would make the luggage slide perpendicular to the original motion (not backward), so d is wrong.
• Options e, f: The luggage slides directly backward, implying only a change in speed (speeding up), not direction. So e and f are wrong.

Answer:

b) speeding up