Two blocks of masses 2 kg and 5 kg are at rest on ground. The masses are connected by a string passing over a frictionless pulley which is under the influence of a constant upward force F = 50 N. The accelerations of 5 kg and 2 kg masses are
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The masses will be lifted if the tension of the string is greater than the gravitational pull on masses.
Weight of 5 kg mass = 5 × 10 = 50 N and 2 kg mass = 2 × 10 = 20 N
From free body diagram
50 – 2T = 0 or T = 25 N
So,5 kg weight cannot lifted ( Q acceleration = 0) but 2 kg weight will be lifted.
∴ ∴ 25 – 20 = 2a or a = 
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