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A man moves on a straight path. He travels total distanceI. He travels half of his journey with speed 10 ms . Theremaining párt of journey was covered by him with speed20 m s for half of remaining time and with velocity40 m s for other half of remaining time. The averagespeed is6.70(a) 15 m s(c) 60 m s(b) ms(d) 10 ms |
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Answer» let the total distance be dFor the first half distance, time taken = distance/speed = (d/2) / 10 = d/20 …..(1) For the second half distance, first half time, speed = 20m/s second half time, velocity = 40m/sdistance covered = speed*time d/2 = 20*t/2 + 40*t/2 = 30t d = 60t average speed =total distance/ total time= d/(t1 + t) d/(d/20 + d/60) = 15m/sThus, average speed is 15m/s (a) is correct option |
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