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At an instasnt t the coordinates of a pa...

At an instasnt `t` the coordinates of a particles are `x=at^(2), y=bt^(2)` and `z=-0`. The magnitude of velocity of particle at an instant is

A

`t sqrt(a^(2) + b^(2))`

B

`2t sqrt(a^(2) + b^(2))`

C

`sqrt(a^(2) + b^(2))`

D

`2t^(2) sqrt(a^(2) + b^(2))`

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The correct Answer is:
B
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MOTION-ONE DIMENSION MOTION-EXERCSE -1 (Section - A : Distance, Displacement, Velocity and Acceleration, Equation of Motion )
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  10. A body starting from rest and has uniform acceleration 8 m//s^(2) . ...

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  16. The position of a particle is expressed as vecr = ( 4t^(2) hati + 2th...

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  17. The position of a particel is expressed as vecr = ( 4t^(2)hati + 2tha...

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  18. A thief is running away on a straight road in a jeep moving with a spe...

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  19. A disc arranged in a vertical plane has two groves of same length dire...

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