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9. At what horizontal distance ‘d’ does the proton return to it’s original elevation? Express your answer in terms of ‘m’ ‘a’ ‘v0’ ‘E’ and electron charge ‘e’

A proton with the mass m is projected into a uniform electric field
that points vertically upward and has magnitude E. The initial
velocity of the proton has a magnitude vo and is directed at an
angle a below the horizontal.

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