Q4. The linear momentum p of a body of mass 2 kg varies with time t as p = 3t^2+4 where p and t are in SI units. It follows that the acceleration of the body at t = 2s is: O 3 m/s^2 O O 9 m/s^2 O 12 m/s^2 O Non of the above 6 m/s^2