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(A) : A body can have acceleration even ...

(A) : A body can have acceleration even if its velocity is zero at a given instant of time.
(r) : A body is momentarily at rest when it reverses its direction of motion.

A

Both (Assertion) and (Reason) are true and (Reason) is the correct explanation of (Assertion)

B

Both (Assertion) and (Reason) are true and (Reason) is not the correct explanation of (Assertion)

C

(Assertion) is true but (Reason) is false

D

(Assertion) is false but (Reason) is true

Text Solution

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The correct Answer is:
A
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(A) : In SHM, acceleration is always directed towards the mean position. (R) : In SHM, the body has to stop momentarily at the extreme position and move back to mean position.

(A): The equations of motion in scalar form can be applied only if acceleration and velocity are along the same line. (R): If the acceleration of a body is constant then its motion is known as uniform motion.

(A): An object may have varying speed without having varying velocity (R) : If the velocity is zero at an instant, the acceleration also zero at that instant.

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AAKASH SERIES-MOTION IN A STRAIGHT LINE -EXERCISE -I
  1. A lift is freely falling from 8th floor and is just about to stop at 4...

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  2. Which of following statements is incorrect?

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  3. (A) : A body can have acceleration even if its velocity is zero at a g...

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  4. The displacement of a particle starts from rest is proportional to the...

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  5. (Assertion) :A body may be accelerated even when it is moving at unifo...

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  6. What determines the nature of the path followed by the particle

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  7. The position-time (x -t) graphs for two children A and B returning fro...

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  8. At time t = 0, two bodies A and B are at the same point. A moves with ...

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  9. Two bodies of different masses are dropped similtaneously from the top...

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  10. At a metro station, a girl walks up a stationary escalator in time t1....

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  11. Two bodies of different masses are dropped similtaneously from the top...

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  12. The acceleration of a moving body can be found from

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  13. A body falls freely from a height 'h' its average velocity when it rea...

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  14. For a moving body at any instant of time

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  15. A body falls freely from a height 'h' after two seconds if accelaratio...

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  16. A body falls freely from a height 'h' after two seconds if we assume t...

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  17. In the case of a body freely falling from small height

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  18. A hydrogen balloon released on the moon from a height will

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  19. A freely falling body traveled xm in n^(th) second distance travelled ...

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  20. A body is projected up with a velocity 50 "ms"^(-1) after one second i...

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