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9th Class Science Time and Motion Question Bank MCQs - Motion

  • question_answer
    Rajeev went from Delhi to Chandigarh and returned to Delhi on his motorbike. The odometer of that read 4200 km at the start of trip and 4460 km at the end of his trip. If Rajeev took 4 h 20 min to complete his trip, then find the average velocity in km/h.

    A) zero               

    B) 60 km/h

    C) 6 km/h             

    D) 180 km/h

    Correct Answer: C

    Solution :

    [c] As we know that, the total distance covered, s = final reading of odometer - initial reading of odometer
    = (4460 - 4200) km = 260 km
    Total Displacement = 0 km
    Total time taken, t=4 h 20 min = 4.33h
    Total displacement
    \[\therefore \operatorname{Average} velocity=\frac{Total displacement(d)}{Total time taken(t)}\]
     \[=\frac{0}{4.33}=0\]


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