An alpha particle which is a helium nucleus q2e

Question

An alpha particle (which is a helium nucleus, Q=+2e, m=6.64×10²⁷kg) is emitted in a radioactive decay with KE = 5.43 MeV.

What is its speed?

Compute the magnitude of the force among two 5.10C point charges 6.6cm apart.

A charge of 1.08mC is placed at each corner of a square 0.380m on a side.

Part A

Decide the magnitude of the force on each charge.

Part B

Decide the direction of the force on each charge.