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

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 acceleration a the block falls through a height h with acceleration g
`(x=1/2at^(2))/(h=1/2"gt"^(2)) rArr x/h=a/g rArr cot theta =a/g, a=g cot theta`
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