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Two point charges each 50 mu C are fixed...

Two point charges each `50 mu C` are fixed on `y`-axis at `y = + 4 m` and `y = - 4m`. Another charged particle having charge `-50 mu C` and mass `20 g` is moving along the positive `x`-axis. When it is at `x = -3 m` , its speed is `20 m//sec`. Find the speed of charged particle when it reaches to origin. Also , find distance of charged particle from origin , when its kinetic energy becomes zero.

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