The position vector of a moving body at any instant of time is given as $$\vec r=(5t^2\hat i-5t\hat j)\,m.$$ The magnitude and direction of velocity at $$t=2\,s$$ is:

A

$$5\sqrt{\ 15}$$, m/s, making an angle of $$\tan^{-1}4$$ with -ve $$Y$$ -axis

B

$$5\sqrt{\ 15}$$, m/s, making an angle of $$\tan^{-1}4$$ with +ve $$X$$ -axis

C

$$5\sqrt{\ 17}$$, m/s, making an angle of $$\tan^{-1}4$$ with +ve $$X$$ -axis

D

$$5\sqrt{\ 17}$$, m/s, making an angle of $$\tan^{-1}4$$ with -ve $$Y$$ -axis