- #1

klwong

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- TL;DR Summary
- I have recently been studying methods of space propulsion. I would like to know if the following approach is feasible for propelling a spacecraft in space.

Assuming there are four robot inside a stationary spacecraft (mass 2 ton) , robot A has an electric gun that can shoot iron balls weighing 1kg at a speed of 8m/s. These balls collide with red balls at a 45-degree angle in a two-dimensional elastic collision. Each ball has a mass of 1kg. The red balls then collide with green and yellow balls in the same manner. Finally, robots B, C, and D catch the balls. After returning the iron balls to their original positions, they repeat the process for 2days (each cycle takes 10 sec). Will the spacecraft move? if yes, what is the speed of it ?