Questions from SolvingPhysics #1

SolvingPhysics

Determine the absolute value of the velocity of a particle at time t=2s if the particle moves according to the law $\displaystyle r=\alpha { t }^{ 2 }\hat { i } +\beta (\sin { \pi t } )\hat { j }$ , with $\displaystyle \alpha =2{ m }/{ { s }^{ 2 } }$ and $\displaystyle \beta =3m$ .

[Answer in S.I units and using correct methods of approximation]