Question

1) during what time interval does car c pass car a?

2) during what time interval does car b pass car c?

Suppose you are looking down from a helicopter at three cars traveling in the same direction along a freeway. The positions of the three cars every 2 seconds are represented by dots on the diagram. The positive direction is to the right.

Answer 1

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a) We see that at t1, all the cars are at the same position. At t2, car C is further on the right than A, that is it passed car A during the time interval (t1-t2).

b) We see that at t4, car C is further down the right (see car C's position at t4) than car B, but at t5, car C is behind car B (right is the positive direction where they are moving). So, car B crossed car C during time interval (t4-t5).

Answer 2

interval T1 to T2