# Problem 11-71 Grav & Elec Potential - Part 2 - B

A particular proton in space is subjected to two fields: a gravitational field ($1.30 \times 10^5\; N/kg$  toward planet $X$), and an electric field ($2.47 \times 10^{-4} \; N/C$ 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.

Accumulated Solution

Correct.

Before continuing, calculate $F_E$ and $F_g$. The mass of the proton is $1.673 \times 10^{-27} \; kg$ and the charge on a proton is $1.602 \times 10^{-19} \; C$.

Continue.