Question

Kiran runs along a straight road of length 150m. After reaching at the end of the road he runs back to his initial position along the same straight path. If he takes a total time of 1 min for completing his running find the average speed and average velocity of Kiran.

Answer 1

Explanation:

Given Kiran runs along a straight road of length 150 m. After reaching at the end of the road he runs back to his initial position along the same straight path. If he takes a total time of 1 min for completing his running find the average speed and average velocity of Kiran.

• Now distance travelled is 150 m + 150 m (since he runs to and fro)
•                                                             = 300 m
•       Total time taken = 1 min  
•                                      = 60 secs
•     Average speed = Distance / Time
•                                = 300 / 60
•                               = 5 m/s
•   Average velocity = total displacement / total time
•       Since Kiran comes back to the same point total displacement is 0
•  Therefore average velocity = 0/60
•                                                 = 0 m/s

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