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The co-ordinates of a moving particle at...

The co-ordinates of a moving particle at anytime 't' are given by ` x = alpha t^(3) and y = beta t^(3)`. The speed of the particle at time 't' is given by

A

`3tsqrt(alpha^(2)+beta^(2))`

B

`3t^(2)sqrt(alpha^(2)+beta^(2))`

C

`t^(2)sqrt(alpha^(2)+beta^(2))`

D

`sqrt(alpha^(2)+beta^(2))`

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