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9.For the velocity-time graph shown in figure below the distance covered by the body in last two seconds of its motion iswhat fraction of the total distance covered by it in all the seven seconds10 -Time (sec)A)C)D) 2 |
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Answer» distance covered in last 2 seconds = area under the curve from time = 5 sec to 7sec = 1/2*(10*2) = 10m and area under the curve from t = 1 to 7 is 1/2*(10*2) +10*2 +1/2*(10*2)= 10+20+10 = 40m so, fraction covered in last 2 sec = 10/40 = 1/4 option B |
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