A 90-kg astronaut is stranded in space at a point 6

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A 90-kg astronaut is stranded in space at a point 6.0 m from his spaceship, and he needs to get back in 4.0 min to control the spaceship. to get back, he throws a 0.50-kg piece of equipment so that it moves at a speed of 4.0 m/s directly away from the spaceship.

(a) does he get back in time?

(b) how fast must he throw the piece of equipment so he gets back in time?