Answer:
1.65
Explanation:
I showed my work in the picture attached.
*Note that in this problem the astronaut is traveling in the opposite direction of the spaceship. This means when you plug in the velocity of the astronaut into your formula, you will have to make the value negative. I almost made this mistake when answering (on left in picture).
This web page helped me solve this problem and understand inelastic collisions a little better:
https://byjus.com/physics/inelastic-collision/
