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Three blocks of masses m1 = 10 kg, m2 = 20 kg are connected by strings on smooth horizontal surface and pulled by a force of 60 N. Find the acceleration of the system and frictions in the string.

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All the blocks more with common acceleration a under the force F = 60 N. 

F = (m1 + m2 + m3)a

To determine, T1 → Free body diagram of mass m1.

T1 = m1a = 10 × 1 = 10 N 

To determine, T2 – Free body diagram of m3.

F – T2 = m3

Solving, we get T2 = 30 N

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