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9th physics homework sum-A train travels first 15 km at a uniform speed 30 km/h.next 75 km at uniform speed 50 km/h.last 10 km at a uniform speed of 20 km/h.calculate the average speed. |
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Answer» e D1 = 15 km Speed V1 = 30 kmph Duration T1 = 15/30 = 0.50 hrsDistance D2 = 75 km speed V2 = 50kmph duration T2 = 75/50 = 1.5 hrsDistance D3 = 10 km speed V3 = 20 kmph duration T3 = 10/20 = 0.5 hrs total D = 100 km total = 2 hours average speed = V = total distance / total TIME duration = 100 km / 2 hrs = 50 kmph==============We can also do this by using the formula:If you can use the formula, that is FINE. Other WISE do that in the first METHOD. |
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