Final answer:
The specifics of the system setup, including the orientation of the blocks and the presence of any inclines or external forces, are needed to calculate the acceleration of the system with two blocks and a given coefficient of kinetic friction.
Step-by-step explanation:
To calculate the acceleration of a system with two blocks where one block has a mass of 2 kg and the other has a mass of 3 kg with a coefficient of kinetic friction of 0.4, you can apply Newton's second law of motion and consider the effects of friction on the system. Assuming the 2 kg block is on an inclined plane or in a similar setup, the force due to gravity along the inclined plane can be calculated for the block. However, without the angle of the incline, the frictional force that acts opposite to the motion, and other necessary details such as the setup of the system and whether any external forces are applied, we cannot provide a specific value for the acceleration.