Displacement - time graph of a body travelling in a straight line is shown in the figure.
Velocity-time graph for the motion of the body will be
A
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B
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C
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D
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Solution
The correct option is D We know that velocity is given by the slope of the displacement - time graph.
From 0 to t1, velocity is positive and constant as indicated by positive and constant slope.
From t1 to t3, slope is zero, hence velocity is zero.
From t3 to t4, velocity is negative and constant as indicated by negative and constant slope.
Option (d) satisfies all these observations.