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[" A disc of mass "5kg" and kept "],[" f...

[" A disc of mass "5kg" and kept "],[" floating horizontally in mid air "],[" by firing "10" bullets per second "],[" vertically up.If the mass of "],[" each bullet is "50gm" and bullets "],[" rebounded with same speed,"],[" the speed of each bullet is "],[m/" sec "(g=10m/sec^(2))]

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