A man is in a car is moving with velocity of 36km/hr. His speed with repect to the car is ____________________?
Correct answer: C. zero
- A. 10m/s
- B. 36m/s
- C. zero
- D. infinite
Explanation
The man and the car are moving together with the same velocity, so their relative velocity is v_man/car = v_man - v_car = 0 m/s. Therefore, relative to the car, he is at rest. The common mistake is choosing 36 m/s by using the man's speed relative to the road instead of relative to the car.
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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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