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The position vector of an object at any ...

The position vector of an object at any time t is given by `3t^(2) hati +6t hayj +hatk`. Its velocity along y-axis has the magnitude

A

6t

B

6

C

0

D

9

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The correct Answer is:
B
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AAKASH INSTITUTE-MOTION IN A PLANE-Assignement section -A Objective (one option is correct)
  1. A vector multiplied by the number 0, results into

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  2. The resultant of two vectors makes an angle of 60^(@) with one vecto...

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  3. The position vector of an object at any time t is given by 3t^(2) hati...

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  4. A body lying initially at point (3,7) starts moving with a constant ac...

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  5. The initial position of an object at rest is given by 3 hati - 8 hatj....

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  6. If |vecP + vecQ|= | vecP| -|vecQ| , the angle between the vectors ve...

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  7. if |vecP + vecQ| = |vecP| + |vecQ| , the angle between the vectors ...

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  8. if vecP a+ vecQ =vec0 , then which of the following is necessarily t...

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  9. A displacment vector fo magnitude 4 makes an angle 30^(@) with the x-...

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  10. If |vecP + vecQ| = |vecP -vecQ| the angle between vecP and vecQ is

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  11. if vecP +vecQ = vecP -vecQ , then

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  12. At the topmost point of a trajectory, its velocity and acceleration ar...

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  13. Two particles are projected with same speed but at angles of projectio...

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  14. A cricket ball of mass m is hitted at the angle 45^(@) to the horizont...

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  15. The pathe of a projectile is

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  16. Two cyclists cycle along circular tracks of radii R(1) and R(2) at uni...

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  17. Which of the following is not a projectile ?

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  18. The maximum number of rectangualr components in which a vector can be ...

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  19. If a stone projected from ground, takes 4 s to reach the topmost point...

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  20. A projectille covers a horizontal distance of 6 m, when it reaches 10 ...

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