An astronaut of mass 774 kg is 299 m far out inspace with, Ask an Expert

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An astronaut of mass 77.4 kg is 29.9 m far out inspace, with both the space ship and the astronaut at rest withrespect to each other. Without a thruster, the only way to returnto the ship is to throw his 0.546 kg wrench directly awayfrom the ship. If he throws the wrench with a speed of 20.8m/s, how many seconds does it take him to reach the ship?

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