The position vector of a particle at time t seconds is r, where r = [ (t² + 1)i + t³j ] m.
The vel of the particle when t = 2 is:
(4i + 6j) m/s.
(2i + 12j)m /s.
(4i - 12j) m/s.
(4i + 12j) m/s.
