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You need to use Heisenberg's uncertainty principle (change in position x change in momentum = h/4pi), change the momentum (delta p) into mass x velocity and then plug in the mass and velocity to solve for the uncertainty in position.
The explanation above is almost correct; you need to plug in the uncertainty in velocity, not the velocity itself. Since the uncertainty is +/- 5 m/s, the entire range of uncertainty is 10 m/s, and this is what you'd plug in for delta V.
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