Two spacemen are floating together with zero speed in a gravity-free region of space. The mass of spaceman `A` is 120 kg and that of spaceman `B` is 90 kg. Spacenab `A` pushes `B` away from him with `B` attaining a final speed of `0.5m//s`. Find the final reciol speed of `A`?.

Answer

`0.38m//s`

Explanation

`m_(A)v_(A)+m_(B)v_(B)=0+0`[conservation of momentum]
`rArrv_(A)=-(m_(B)v_(B))/(m_(A))=-((90)(0.5))/(120)=-0.375m//s`