Blocks A (1kg) and B (2kg) are in contact on a smooth horizontal surface. A horizontal force of 6N is applied on A towards B.
a. (i) Write the pair of forces that A and B exert on each other according to Newton’s third law, indicating their directions.
b. (ii) If A and B are treated as a single system, will the forces identified in (i) affect the acceleration of the system? Give a reason for your answer.