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and otherwise how long the druakard takes to lall rstart.A jet airplane traat the speed of 1500 km h-1 relative to the jet planelatter with respect to an observer on the groundvelting at the speed of 300 km h-I ejects its products of combustionhat ts the Speed of thethl histway with speed of 126 km b s brought to aaf the ear (assumed3.5

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