An 80-kg astronaut becomes separated from his spaceship. He is 15.0 m away from it and at rest relative to it. In an effort to get back, he throws a 500-g object with a speed of 8.0 m/s in a direction away from the ship. How long does it take him to get back to the ship?
a) 1 s
b) 10 s
c) 20 s
d) 200 s
e) 300 s
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