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Question

# Two masses m1=10 kg and m2=5 kg are connected by an ideal string as shown in the figure. The coefficient of friction between m1 and the surface is μ=0.2. Assuming that the system is released from rest. The velocity of blocks when m2 has descended by 4 m is (g=10 m/s2)

A
4 m/s
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B
8 m/s
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C
2 m/s
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D
12 m/s
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Solution

## The correct option is A 4 m/sFrom constraint equationsvm1=vm2=vdm1=hm2=4mUsing the work energy theorem,⇒Ei−Ef= Work done against friction0−[12×(10+5)(v2)−5×10×4]=0.2×10×10×4Solving we get,v=4m/s

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