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A person walks from point P to point Q a...

A person walks from point P to point Q along a straight road in 10 minutes, then turns back and returns to point R which is midway between P and Q after further 4 minutes. If PQ is 1 km, find the average speed and velocity of the person in going from P to R.

Text Solution

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The path length travelled by the person is 1.5 km while the displacement is the distance between R and P which is 0.5 km. The time taken for the motion is 14 min.
The average speed = 1.5/14 = 0.107 km/min = 6.42 km/hr. The magnitude of the average velocity=0.5/14 = 0.0357 km/min = 2.142 km/hr.
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