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[" 47.If a man increase his speed by "2m...

[" 47.If a man increase his speed by "2m/s" ,his "KE" .is doubled,"],[" the original speed of the man is "],[[" (a) "(2+2sqrt(2))m/s," (b) "4m/s],[" (6) ",(2+2sqrt(2)lm/s],[" G."," A ball is released from certain height "m/s]]

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