Two equal velocities have got a resultant equal to either.what is the angle between them ?

In case of parallel vectors, what is the angle between the two vectors.

Two small balls having equal positive charges Q coulomb on each are suspended by two insulating strings of equal length L metre from a hook fixed to a stand. This whole setup is taken in a satellite into space, where there is no gravity (state of weightlessness). What is the angle between the strings? Find out the tension in each string.

What is the angle between any two bonds in methane?

Force between two charges varies directly as the square of the distance between them. !