Kinetic energy of ball sliding down slope with electric field?? 1. The problem statement, all variables and given/known data As shown in the figure above, a positively charged ball is placed at point A and slides down the slope from rest. The area has a uniform electric field E = 26.1 N/C, pointing to the right. The mass of the ball is m = 27 kg and the charge is q = +4.6 C. When the ball reaches point B, it travels horizontally there after. The height from A to B is h = 23 m and the horizontal distance between A and B is d = 47 m. You can ignore friction and use g = 10 m/s2 for your calculation. 1. How much is the kinetic energy of the ball when it reaches at B (in the unit of J)? 2. If the electric field is changed to the opposite direction, How much is the kinetic energy of the ball when it reaches at B (in the unit of J) now? 3. What is the minimum strength of electric field E that can be used to stop the particle right at Point B? 2. Relevant equations 3. The attempt at a solution probably need to use Ke = qEd ..? i tried but getting the wrong answer. for d i calculate using pythorean x^2+y^2=d^2 so 23^2+47^2=d^2 is that rite way to do?