A person moves with speed 30 m/s for the first t second, then he moves with speed 50 m/s for next t second on a straight line path.Find average speed of the person
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Consider 3 collinear points A , B and C. Person moves from A to B with speed 30m/s for t seconds.
Then moves from B to C with speed 50m/s for another t seconds.
Distance between A &B = speed × time
= 30m/s × t s
= 30t m
Distance between B& C = speed × time
= 50m/s × t s
= 50t m
Total distance travelled = 30t m + 50t m
= 80t m
Total time taken = t + t =2t
Average speed = total distance / total time
= 80t m ÷ 2t = 40m/s
~ Average speed of person is 40m/s.
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