In v−t graph shown in fig. the displacement of the body in 4 seconds will be, if it starts from origin.
A
70m
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B
90m
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C
80m
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D
100m
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Solution
The correct option is B90m Given v−t curve as
So, displacement of the body is given by the area under the v−t curve ⇒D=(12×(40−20)×2)+(20×2)+(20×1)+(12×1×20 ) ⇒D=20+40+20+10=90m