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[" 7.A bullet moving with a speed of "10...

[" 7.A bullet moving with a speed of "100ms^(-1)" can "],[" just penetrate two planks of equal thickness."],[" Then the number of such planks penetrated "],[" by the same bullet when the speed is doubled "],[" will be "],[[" 1) "4," 2) "8],[" 3) "6," 4) "10]]

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