For the displacement-time graph shown in figure, the ratio of the magnitudes of the velocities during the first two second and the next four second is
A
1 : 1
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B
2 : 1
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C
1 : 2
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D
3 : 2
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Solution
The correct option is B 2 : 1 Slope of displacement-time graph represents velocity. Velocity from t=0sec to t=2sec is given by v1=202ms−1 Velocity from t=2sec to t=6sec is given by v2=−204ms−1 (∵ direction gets reversed) ⇒ Ratio of magnitudes of velocities =v1v2=105=2:1