Two buses moving at 100 km/h and 80 km/h respectively cross each other while moving in opposite direction. Velocity of one bus relative to other bus is
Correct answer: D. 180 km/h
- A. 100 km/h
- B. 20 km/h
- C. 80 km/h
- D. 180 km/h
Explanation
Here the two buses are moving in the opposite directions Their speeds are u=100 km/hr and v=80 km/hr ∴ Relative speed =(u+v) km/hr =(100+80)=180 km/hr Hence, the buses have their relative speeds as 180 km/hr.
This question appeared on the NUMS 2022 paper, which you can sit online with every answer explained.
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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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