The position vector of a moving body at any instant of time is given as \(\overrightarrow{\mathrm{r}}=\left(5 \mathrm{t}^{2} \hat{\mathrm{i}}-5 \mathrm{t} \hat{\mathrm{j}}\right) \mathrm{m}\). The magnitude and direction of velocity at t = 2s is, 

1
\(5 \sqrt{15}\) m/s, making an angle of tan–1 4 with –ve Y axis 
2
\(5 \sqrt{15}\) m/s, making an angle of tan–1 4 with +ve X axis
3
\(5 \sqrt{17}\) m/s, making an angle of tan–1 4 with –ve Y axis 
4
\(5 \sqrt{17}\) m/s, making an angle of tan–1 4 with +ve X axis 

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