1. The problem statement, all variables and given/known data An alpha particle 4 2 He 2+ approaches a stationary gold nucleus 197 79 Au at a speed of 7.0 X 10^6 ms-1. By considering only electrostatic repulsion, calculate the closest possible distance of apporach between the alpha particle and gold nucleus. 2. Relevant equations - 3. The attempt at a solution Charge of Helium particle = 2e Charge of gold nucleus = 79 e And im just stuck here, how do i use the value of the speed of the particle in my working?