A boy covers 50 m in 10 sec,40 m in next 10 sec and 30 m in the last 10 sec. Calculate the average speed of the boy.
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Answer is 4m per second or 40m per 10 seconds. Average=40m
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average speed = total distance covered / total time taken
50+40+30/10+10+10
= 4 ms^-1
50+40+30/10+10+10
= 4 ms^-1
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