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Q.
Three equal weights of $3\, kg$ each are hanging on a string passing over a frictionless pulley as shown in figure. The tension in the string between masses II and III will be (Take $g=10 \,m / sec ^{2}$ )
Three equal weights of $3\, kg$ each are hanging on a string passing over a pulley as shown in figure.
If a is the common acceleration.
$T-3 g=3 a$ (For mass I)
$3 g+T_{1-} T=3 a$ (For mass II)
$3 g-T_{1}=3 a$ (For mass III)
Adding, above three equations
$3 g=9 a, a=g / 3$
$T_{1}=3 g-3 a=3 g-g=2 g=20 \,N$
