Learning Goal:

To practice Problem$-$Solving Strategy $21\mathrm{.}1$ Conservation of energy in charge interactions.

An alpha particle $(),$ which is the same as a helium$-4$ nucleus, is momentarily at rest in a region of space occupied by an electric field. The particle then begins to move. Find the speed of the alpha particle after it has moved through a potential difference of $-3\mathrm{.}45{10}^{-3}V.$

The charge and the mass of an alpha particle are $q_{}=3\mathrm{.}20{10}^{-19}C$ and $m_{}=6\mathrm{.}68{10}^{-27}kg,$ respectively.

Mechanical energy is conserved in the presence of which of the following types of forces?

Select all that apply.

magnetic

gravitational

frictional

electrostatic