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An object may have ( a) varying speed w...

An object may have
( a) varying speed without having varying velocity
(b) varying velocity without having varying speed
(c) nonzero acceleration without having varying velocity
(d) nonzero acceleration without having varying speed.

A

a, b & c are correct

B

b & d are correct

C

a, b & d are correct

D

a & d are correct

Text Solution

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The correct Answer is:
B
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(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): A body may be moving with uniform speed and non uniform acceleration. (R): A body may have uniform velocity and nonzero acceleration.

Can a particle have a constant velocity and varying speed ?

(A): Acceleration is the rate of change of velecity. (R): A body having nonzere acceleration can have a constant velocity.

Read each statement below carefully and state with reasons and examples, if it is true or false , A particle in one-dimensional motion (a) with zero speed at an instant may have non-zero acceleration at that instant (b) with zero speed may have non-zero velocity, (c) with constant speed must have zero acceleration, (d) with positive value of acceleration must be speeding up.

AAKASH SERIES-MOTION IN A STRAIGHT LINE -EXERCISE -I
  1. Which of the following graph represents uniform motion

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  2. The area under acceleration-time graph gives

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  3. Which of the following velocity-time graphs shows a realistic situatio...

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  4. Consider the motion of the tip of the minute hand of a clock. In one h...

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  5. Which of the following velocity-time graphs represent uniform motion

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  6. A particle moves along the X-axis as x=u(t-2)+a(t-2)^2 (a) the init...

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  7. An object may have ( a) varying speed without having varying velocity...

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  8. Mark the correct statements for a particle go ing on a straight line: ...

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  9. The velocity of a particle is zero at t = 0. (a) The acceleration a...

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  10. The velocity-time plot for a particle moving on a straight line is sho...

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  11. Velocity (v) versus displacement (x) plot of a body moving along a str...

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  12. Following are four different relation about displacement,velocity and...

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  13. For an object moving with uniform acceleration, travelling 50m in 5th ...

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  14. A body projected vertically with a velocity 'u' from the ground. Its v...

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  15. Read the following statements and choose the correct answer. (a) For...

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  16. Height of the body from the ground can be calculated by using the form...

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  17. A balloon from rest accelerates uniformly upward with 'a' ms^(-2), for...

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  18. In one dimensional motion, instantaneous speed V satisfies 0 le V lt V...

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  19. A particle starts from point A moves along a straight line path with a...

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  20. Assertion: Always |(dvecv)/(dt)|=d/(dt)|vecv| , where vecv has its usu...

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