Question $2(4$ marks$)$

Two astronauts are floating motionless in empty space far from the Earth. One of them has mass $45\mathrm{.}0$ kg and is holding a $10\mathrm{.}0$ kg oxygen tank. He pushes the tank directly toward the second astronaut $($who has a mass of $55\mathrm{.}0$ kg $),$ who catches and holds it$.$ If the speed of the tank relative to the second astronaut was $\backslash (1\mathrm{.}00\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$sec$\}\backslash ),$ then what is the final speed of the second astronaut relative to the first one, after the second one has caught the tank?