# It is a Question!

• Jul 26th 2006, 11:20 AM
maritza
It is a Question!
Astronaut jennifer's lifeline to her spaceship comes loose and she finds herself stranded at a constant 100.0m from the spaceship. She throws her 2.00 kg wrench at 20.0 m/s in a direction away from the spaceship. If she and her spacesult have a combined mass of 200 kg how long does it take her to coast back to her spaceship?
• Jul 26th 2006, 12:02 PM
CaptainBlack
Quote:

Originally Posted by maritza
Astronaut jennifer's lifeline to her spaceship comes loose and she finds herself stranded at a constant 100.0m from the spaceship. She throws her 2.00 kg wrench at 20.0 m/s in a direction away from the spaceship. If she and her spacesult have a combined mass of 200 kg how long does it take her to coast back to her spaceship?

Conservation of momentum tells us that her velocity is 0.2 m/s (the ratio of
wrench mass to her mass times the wrench velocity) towards her spacecraft,
so she takes 100/0.2=500 s to reach the spacecraft.

RonL