Particles A and B, of masses 4 kg and 6 kg respectively, are connected by a light inextensible string on a smooth horizontal surface. A horizontal force of 50 N acts on B. A second horizontal force of 10 N acts on A in the opposite direction.
Find the acceleration of the system.
Find the tension in the string.
State the force that forms a Newton's third-law pair with the force exerted by the string on A.