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[" A block of mass "m" is resting on a w...

[" A block of mass "m" is resting on a wedge of angle "theta" as shown in the "],[" figure.The wedge is given an acceleration "a" .What is the value of "a" so "],[" that the mass "m" falls freely "],[[" (A) "g," (B) "g cos theta," th "],[" (C) "g tan theta," (D) "g cot theta]]" ,"

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