A velocity vector for an object is given by v(t) = 6 m s i + 5 m s 2 tj. Please find: a) The speed at t=2s, b) The displacement of the object between t=0s and t=2s, c) Its position at t=2s if it had an initial position of r(0) = 5mi 3mj, d) The acceleration at t=5s