Why is the following situation impossible? You set up an apparatus in your labor

Question

Why is the following situation impossible? You set up an apparatus in your laboratory as follows. The x axis is the symmetry axis of a stationary, uniformly charged ring of radius R = 0.500 m and charge Q = 50.0 mu C. You place a particle with charge Q = 50.0 mu C and mass m = 0.100 kg at the center of the ring and arrange for it to be constrained to move only along the x axis. When it is displaced slightly, the particle is repelled by the ring and accelerates along the x axis. The particle moves faster than you expected and strikes the opposite wall of your laboratory at 40.0 m/s.

Explanation / Answer

potential energy of system=kq^2/r=45 J energy of body at 40 m/s=0.5*0.1*40^2=80 J since potential maximum energy that can be converted equals to 45 J ,so vel cant be 40 m/s

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