An 80 kg astronaut is floating at rest a distance of 10 m from spaceship when he runs out of oxygen to power him back to the spaceship.He removes his oxygen tank(3 kg) and push it into space away from the ship with a speed of 15 meter per second.
a.At what speed does he recoil toward the spaceship?
b.How long must he hold his breath before reaching the ship?
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