11-71. A particular proton in space is subjected to two fields: a gravitational field (1.30X105 N/kg  toward planet X), and an electric field (2.47X10-4 N/C away from planet X).
 (a) If the proton is released from rest, in which direction will it move?
 (b) After moving 1.50 m, what will be its speed? Use energy methods and assume uniform fields.


Which are the correct expressions for the magnitudes of the two forces, that is, the Electric forceFE and the gravitational force Fg ?

(A)   FE = mg     Fg = qE
(B)   FE = qE     Fg =  mg
(C)   FE = qg     Fg = mE