Have you used any trigonometry? You should use trig. to work out the angle the strings make with the horizontal.
I've tried drawing a freebody diagram and trying some stuff but can't manage anything.
Some trig + circular motion should help you win this.
I've tried drawing a freebody diagram and trying some stuff but can't manage anything.
just solve for1.Draw a FBD
2.Find the angles the balls make with the horizontal
3.Resolve respective forces, you should have something like