At 0.1m, the restoring force would be 25 Newtons. It would probably not be possible to stretch to 5 meters because that would cause a restoring force of 1250 Newtons.
Explanation:
Because the simple cell is not used to produce current for a long time because of the defects like polarization and local action.
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Hey - for this problem you will find out your new velocity (similar to speed)
You take your Initial Velocity and add to it all the gained velocity you get during this process (which is the Acceleration multiplied by the amount of Time you are accelerating for)
So we get (Final Velocity) = (Initial Velocity) + (Time)(Acceleration)
In your equations, thats (Final Velocity) = (10 meters/second) + (5 seconds)(2.1 meters/second/second)
Which is 10 + 10.2 = 20.2 meters/second