In the arrangement shown in figure, there is no friction between the block and the surface. Find the acceleration of the block when it just loses contact with the surface.
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answer is 3.
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Detailed Solution
When the block loses contact with the surface, 2tsin30o−20=0⇒t=20 s∴ Acceleration a=2tcos30o2=20×32 m/s2=103 m/s2