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A boy goes to market at an average speed of29 kmph. Finding the market closed, he immediatelyreturns back by the same path with an average speedof 40 km h-1. Find the (a) average speed (b) averagevelocity for the complete journey. |
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Answer» Distance = s in both caseT1 = s/v1 =s/29 hT2=s/v2 =s/40 hA) Av speed for whole trip =total distance /total time = s+s/t1+t2=2s km/ s/29+ s/40 h=2s/69s/1160 km/h=2× 1160/69 =33.62 km/hAnd B)Displacement=0T1=0/29 km/hT2=0/40 km/hAverage velocity=displacement/time takenAv=0/0/1160=0km/h because displacement is 0 |
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