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The position vector vecr of a particle v...

The position vector `vecr` of a particle varies with time t as `vecr = at^2 hati+bt hatj` then the magnitude of the instantaneous velocity of the particle at time t will be

A

2at+b

B

`sqrt(4a^2t^2+b^2)`

C

2a+b

D

`sqrt(4a^2+b^2)`

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The correct Answer is:
B
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