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[" A boy standing on a weighing machine notices his weight as "400N" .When he suddenly jumps-upwards "],[" the weight shown by the machine becomes "600N" .The acceleration with which the boy jumps up is : "],[" (Take "g=10m/s^(2)" ) "],[[" (A) "5ms^(-2)," (B) "3.4ms^(-2)," (C) "6ms^(-2)," (D) "9.8ms^(-2)]]

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