Two cars are traveling down the highway in the same direction. Car A is traveling at 30.0 m/s and car B is passing car A at a relative speed of 3.0 m/s. What is the speed of car B with respect to the highway?
A) 27.0 m/s
B) 30.0 m/s
C) 33.0 m/s
D) 32.9 m/s
E) 33.1 m/s

Question

Quizplus · Accepted Answer

The speed of car B with respect to the highway is equal to its speed relative to car A plus the speed of car A with respect to the highway. Therefore, the speed of car B with respect to the highway is 30.0 m/s (the speed of car A with respect to the highway) + 3.0 m/s (the speed of car B relative to car A) = 33.0 m/s.

Two Cars Are Traveling Down the Highway in the Same