Laws of MotionHard
Question
In the system shown in the figure, the acceleration of the 1 kg mass and the tension in the string connecting between A and B is :
Options
A.
downwards,
downwards,B.
upwards, 
upwards, C.download, 
download, D.
upwards, g
upwards, gSolution
10 − T2 = 1 a [ Newton′s II law for A ]
T2 + 30 − T1 = 3 a [ Newton′s II law for B ]
T1 − 30 = 3a [ Newton′s II law for C ]
⇒ a = g/7
⇒ T2 = 6g/7
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