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45. We take the positive direction to be to the right in the figure. The acceleration of the
proton is
a
p
=
eE
/
m
p
and the acceleration of the electron is
a
e
= –
eE
/
m
e
, where
E
is the
magnitude of the electric field,
m
p
is the mass of the proton, and
m
e
is the mass of the
electron. We take the origin to be at the initial position of the proton. Then, the coordinate
of the proton at time
t
is
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 Fall '10
 Rebello,NobelS
 Acceleration, Mass

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