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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 (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

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.

(A): The body falls freely, when acceleration of body is equal to acceleration due to gravity (R): A body falling freely will have constant velocity

AAKASH SERIES-MOTION IN A STRAIGHT LINE-Exercise 2A
  1. (A): A body may be moving with uniform speed and non uniform accelerat...

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  2. (A): Acceleration is the rate of change of velecity. (R): A body hav...

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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. (A): Velocity- time graph for an object in uniform motion along a stra...

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

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  6. (A) : Average speed is equal to total distance travelled divided by lo...

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  7. (A): The average and instantaneous velocities have same value in a uni...

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  8. (A): The speedometer of an automobile measure the instantaneous speed ...

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  9. (A): A negative acceleration of a body is associated with a slowing do...

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  10. (A): A body thrown up from the top of a tower and another body thrown ...

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  11. (A): The body falls freely, when acceleration of body is equal to acce...

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  12. (A): Displacement of a body is the signed sum of the area under veloci...

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  13. (A): Two balls of different masses are thrown vertically upward with s...

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  14. (A): The Instantaneous velocity does not depend on instantaneous posit...

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  15. (A): A balloon ascends from the surface of earth with constant speed. ...

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  16. (A): Always |(d vecv)/(dt)|=(d)/(dt) |vecv|, where vecv has its usual ...

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  17. (A): A lift ascending with decreasing speed means acceleration of lift...

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  18. (A): The v-t graph perpendicular to time axis is not possible in pract...

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  19. (A): If vecr(1) and vecr(2) be the initial and final displacement in t...

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  20. (A): Body projected vertically up or down from the top of a tower with...

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