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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

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

B

`v/(sqrt(2))`

C

`v/(sqrt(3))`

D

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

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