Dimensional formula for activity of radioactive substance is

If $e$ is the electronic charge,$c$ is the speed of light in free space,and $h$ is Planck's constant,the quantity $\frac{1}{4 \pi \varepsilon_{0}} \frac{| e |^{2}}{h c}$ has dimensions of .......

Dimensional formula for the universal gravitational constant is

The dimensional formula for impulse is

The dimensional formula for volume elasticity is:

What are the dimensions of the change in velocity?