A man hit a ball (0.2kg) which the accelerates at a rat of 20m/s2

.2kg • 9.8 • 20m/s^2 = 784

your final answer is 784

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass