It is theorized that an astronaut stranded in outer space could move around by using a flashlight. Suppose an astronaut in a space suit has a mass of 150 kg and carries a 100W flashlight that emits a cylindrical beam of light with a radius of 1 cm. If the astronaut is stranded 200 m from his ship, how long would it take him to get back using only the flashlight? Assume that he starts at rest and points the flashlight directly away from the ship.
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