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v = dr/dt
v = d[ (2t -1) + (12t-t²) ] / dt
v= 2i + (12 - 2t)j m/s
(B)
r(t) = [ (2t -1) + (12t-t²) ]
r(t) = [ ( 2(2)-1)i + ( 12(2) - (2)²j ]
r(t) = (4-1)i + (24-4)j
r(t) = 3 i + 20 j
r(t) = √3² + 20²
r(t) = √409 m/s