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Assertion : An object may have varying s...

Assertion : An object may have varying speed without having varying velocity.
Reason : If the velocity is zero at an instant, the acceleration may not be zero at that instant.

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 in not the correct explanation of Assertion.

C

If Assertion is true but Reason is false.

D

If Assertion is false but Reason is true.

Text Solution

Verified by Experts

The correct Answer is:
D
If speed varies, then velocity will definitely vary. When a particle is thrown upwards, at highest point
`a ne 0` but `upsilon = 0`.
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Knowledge Check

  • Assertion: An object can have constant speed but variable velocity. Reason: Speed is a scalar but velocity is a vector quantity.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • Assertion : At object may fall with a constant velocity. Reason : This happens when acceleration of the object is equal to accelertion due to gravity.

    A
    If both assertion and reason are trure and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanations of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason is false

  • The question given below consist of an assertion and the reason . Use the following key to choose appropriate answer: Assertion : At the highest point velocity of the projectile is zero Reason : At the highest point of trajectory acceleration of the particle becomes zero for an instant .

    A
    If both assertion and reason are correct and reason is a correct explanation of the 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 .
    D
    If both assertion and reason are incorrect .

    • Similar Questions

    Explore conceptually related problems

    An object may have (a). Varying speed without having varying velocity (b). Varying velocity without having verying speed (c). Non zero acceleration without having varying velocity (d). Non zero acceleration without having varying speed.

    Can a body have zero velocity and finite acceleration?

    Assertion : The accelerated motion of an object may be due to change in magnitude of velocity or direction of velocity or both. Reason : Acceleration can be produed only by change in the magnitude of the velocity.

    Assertion : An object may have acceleration even if it is moving with uniform velocity Reason : An object may be moving with uniform velocity but it may be changing its direction of motion

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