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Zeta Anderson, futuristic super-spy for the Terran Confederation, has completed her objective of stealing intelligence from the Zorn collective. Stealthily, she slips into her space suit (with jet-pack), and slips from an airlock, headed for her stealth ship. Her jet-pack can supply her with a constant acceleration, and gravity can be neglected. When she turns on her jet-pack, how does her velocity change? Since she does not want to be going too fast (and either overshoot, or collide with her ship), how does her velocity change when she turns the jet-pack off?

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Explanation:

First lets understand the 2nd law of motion by Sir Isaac Newton. According to this law,

[tex]Force = mass\times acceleration[/tex]

[tex]Velocity = acceleration\times time[/tex]

Since the spy is in space there is no medium and hence no friction to restrict the motion. Thus, when the spy turns on the jet pack, she will be accelerated and her velocity will increase. As there is no medium so no friction. So even when she turns her jet-pack off the velocity will not change. Although the acceleration will be zero but she will be moving with a constant velocity until an opposite force is applied. That can be done using reverse thrust.

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