The displacement versus time graph for a body moving in a straight line is shown in the figure. Which of the following regions represents no force is acting on the body?
A
ab
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B
bc
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C
cd
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D
be
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Solution
The correct option is B bc The slope of displacement versus time graph gives the velocity. This is constant here only for the portion bc, as the graph is a straight line under this section. Constant velocity means no acceleration and no acceleration means no force acting on the body.