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Question
Assertion :Average velocity can't be zero in case of uniform acceleration. Reason: For average velocity of a moving body to be zero, velocity should not remain constant.
Assertion :Average velocity can't be zero in case of uniform acceleration. Reason: For average velocity of a moving body to be zero, velocity should not remain constant.
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Solution
The correct option is D Assertion is incorrect but Reason is correct
Average velocity is given by the ratio of change in displacement to change in time.
When a particle is thrown upwards, it is under a uniform acceleration equal to the acceleration of gravity. After some time, it returns to its point of projection. In this time interval, net displacement is zero and hence average velocity is zero. Hence, assertion is incorrect.
For a moving body, velocity is non-zero. If velocity is constant, displacement will keep increasing and hence, average velocity cannot be zero for a body under uniform motion. For average velocity to be zero, the body should either be at rest which is false as per the statement of the reason or it should be able to return to its initial position which requires a change in velocity. Hence, reason is correct.
Average velocity is given by the ratio of change in displacement to change in time.
When a particle is thrown upwards, it is under a uniform acceleration equal to the acceleration of gravity. After some time, it returns to its point of projection. In this time interval, net displacement is zero and hence average velocity is zero. Hence, assertion is incorrect.
For a moving body, velocity is non-zero. If velocity is constant, displacement will keep increasing and hence, average velocity cannot be zero for a body under uniform motion. For average velocity to be zero, the body should either be at rest which is false as per the statement of the reason or it should be able to return to its initial position which requires a change in velocity. Hence, reason is correct.
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