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Two blocks of mass 3kg and 2kg are connected by a string passing over a light, friction less pulley. If the system is released from rest, net work done by gravity in 2s is ______(g=10ms−2)

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answer is 40J.

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Detailed Solution

a=m1−m2gm1+m2=1×105=2ms−2S1=S2=ut+12at2=0+12×2×4=4mW=W1+W2=m1gS1cos⁡0∘−m2gS2cos⁡180∘W=[3×10×4]−[2×10×4]W=40J
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