You are an astronaut stranded in space. Your spacecraft lies about 20.0-m away. You have a flashlight that can generate 150-W of light.
(a) Using the flashlight's directed beam to change your momentum, how long would it take you to get back to your spacecraft? Calculate using 52000 grams mass m.
(b) What if, instead, you threw the flashlight away from you to change your momentum toward the spacecraft. If the flashlight had a mass of 2.00-kg and traveled at a speed of 10.0 m/s, how long would it take you to get back?