Answer: -8.5 × 10^-4 m/s
Step-by-step explanation:
The following can be deduced from the question:
m₁ = Mass of a wrench = 4 g = 0.004 kg
v₁ =Speed of wrench = -15 m/s
m₂ = Mass of the Astronaut = 70 kg
The velocity will be calculated as:
m₁v₁ = m₂v₂
v₂ = [0.004 × (-15)] / 70
= -8.5 × 10^-4 m/s
Therefore, the velocity is -8.5 × 10^-4 m/s