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Question

In vt graph shown in fig. the displacement of the body in 4 seconds will be, if it starts from origin.

A
70 m
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B
90 m
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C
80 m
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D
100 m
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Solution

The correct option is B 90 m
Given vt curve as

So, displacement of the body is given by the area under the vt curve
D=(12×(4020)×2)+(20×2)+(20×1)+(12×1×20 )
D=20+40+20+10=90 m

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