At time t = 0, a particle is moving with (2 )) m/s. At t = 3 s, it is found to have a velocity of (-8i+ 12)) m/s. Compute the (i) acceleration of the particle in unit-vector notation. (ii) position of the particle at t = 5 s in unit-vector notation. Three vectors are given by P = 31 + 3j - 2k , Q = -i- 4j + 2k and R = 21 + 2j + k. Compute the (a) angle between P x (Q + R) (b) (P . 2Q) x R