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a car travels certain distance with a speed of 50kmh-¹ and returns with a speed of 40kmh-¹. calculate the average speed of whole journey |
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Answer» Answer: 50 km/h =50×1000/1×60×60 =125/9 m/s 40 km/h =40×1000/1×60×60 =100/9 m/s Second Distance= 100M in 9s Avg.Speed= TOTAL S/total T =125+100/9+9 m /s =225/18 m/s =12.5 m/s |
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