Two blocks of masses 10 kg and 20 kg are connected by a massless string and are placed on a smooth horizontal surface as shown in the figure. If a force F = 600 N is applied to 10 kg block, then the tension in the string is, if a force F is applied to 20 kg block, then the tension in the string is

(2)

When a force is applied on 20 kg block, then the tension in string is