First slide

Instantaneous acceleration

Question

Directions:These questions consists of two statements each printed as Assertion and Reason. While
answering these questions you are required to choose anyone of the following four responses.
Assertion :The v- t graph perpendicular to time axis is not possible in practice.
Reason: Infinite acceleration cannot be realised in practice.

Moderate

A

If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
B

If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion,
C

If Assertion is correct but Reason is incorrect.
D

If Assertion is incorrect but Reason is correct.

Solution

$a = \frac{d v}{d t} =$ slope of v-t graph.
Perpendicular to t-axis, slope = $\infty$ , therefore a = $\infty$
Also at a given instant of time a particle cannot have different velocities .

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