1. The problem statement, all variables and given/known data A proton moves at 4.50x10^5 m/s in the horizontal direction. It enters a uniform vertical electric field with a magnitude of 9.60x10^3 N/C. Ignoring any gravitational effects, find a) the time interval required for the proton to travel 5.00 cm horizontally b) its vertical displacement during the time interval in which it travels 5.00 cm horizontally c) the horizontal and vertical components of its velocity after it has traveled 5.00 cm horizontally. 2. Relevant equations a= qE/m 3. The attempt at a solution I know I need to use the above equation at some point in this problem but I have no idea how to go about finding the time interval.