Two cars are moving in opposite directions with speed v. What is the magnitude of their relative velocity?
Correct answer: D. 2v
- A. 0
- B. v
- C. v/2
- D. 2v
Explanation
When two cars are moving in opposite directions at the same speed v, their relative velocity is the sum of their speeds: v + v = 2v. Hence, the magnitude of their relative velocity is 2v. The other options are incorrect because they do not account for the addition of speeds in opposite directions.
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About Displacement and Velocity
Displacement is the directed change in position, while velocity is the rate of change of displacement and includes both magnitude and direction. The topic connects position-time and velocity-time graphs with average and instantaneous values, and distinguishes displacement from distance and velocity from speed.
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