Assertion :In displacement-time graph of a particle as shown in figure, velocity of particle changes its direction at point A. Reason: Sign of slope of s-t graph decides the direction of velocity.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Assertion is incorrect but Reason is correct.

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Solution

The correct option is D Assertion is incorrect but Reason is correct.
At point A, sign of slope of $s - t$ graph is not changing. Therefore, sign of velocity is not changing. As the sign is not changing so the direction of the velocity is also not changing. Hence D is the correct answer.

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