Q )A man walks 7 km East in 2 hours and then 2.5 km West in 1 hour.
a) What is the man's average speed for the whole journey?
b) What is the man's average velocity for the whole journey?
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Answer:
Average speed = 3 km/hr.
Average velocity = 3 km/hr.
Explanation:
We know that
Speed = Total distance / Total time
Total distance travelled by man = 7 km + 2 km = 9 km
Total time taken = 2 + 1 = 3 hrs
Average speed = 9/3 = 3 km/hour.
Velocity = Total displacement / Total time
Average velocity will be the same as average speed in this case since there is no direction change mentioned.
Therefore Total Displacement = Total Distance
average velocity = average speed = 3 km/hour
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