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  4. Two blocks of mass 1 kg 2 kg are hanged from a light pulley and resting on a horizontal surface. A time varying force F = 4t N is acting on pulley in the direction shown. Time after which block will break off the surface will be - <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-uuykz2tk2bc4.png />

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Q. Two blocks of mass 1 kg & 2 kg are hanged from a light pulley and resting on a horizontal surface. A time varying force F = 4t N is acting on pulley in the direction shown. Time after which block will break off the surface will be -
Question

NTA AbhyasNTA Abhyas 2020Motion in a Plane

Solution:

Solution
1 kg block
$N+F/2=10;$
$\Rightarrow F=2\left(\right.10-N\left.\right)$
Block 1 will leave
surface when N = 0
$\Rightarrow F=20\Rightarrow 5sec $