Hello I am finding issues with a problem I am trying to solve. The questions asks:

Two identical point charges (**q=+1.70 x 10-^6 C**)
are fixed at opposite corners of a square whose sides have a length
of **L=0.620 m**. A test charge (**qo=-1.90 x
10^-8 C)**, with a mass of **m=7.00 x 10^-8**,
is released, starting from rest, at one of the corners of the
square. All three charges are on a horizontal, frictionless
surface.

A) What is the magnitude of the resultant electrostatic force on
the test charge, **qo**, due to the other 2 charges,
when **qo** is located at the corner of the
square?

B) What will be its speed, **vf**, of the test
charge, **qo**, when it reaches the center of the
square?

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