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For what value of 'a' the block falls fr...

For what value of 'a' the block falls freely ?
.

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In the time the wedge moves a distance 'x' towards left with an acceleration a the block falls from a height 'h' with acceleration 'g'
`x =(1)/(2) at^(2) ,h = (1)/(2)"gt"^(2) rArr (x)/(h) =(a)/(g) , rArr cot theta = (a)/(g) rArr a = g cot theta` .
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