Inelastic collision of a projectile with a pendulum

[mjolnir80]

Homework Statement

a 20 kg wood ball hangs from a 2.0 m long wire. the maximum tension the wire can withstand without breaking is 400 n. a 1.0 kg projectile traveling horizontally hit and embeds itself in a the wood ball. what is the largest speed this projectile can have without causing the cable to break

Homework Equations

The Attempt at a Solution

im kind of stumped with this one
some help would really be appreaciated :)

 

[mgb_phys]

hint - centrifugal force for the tension in the wire, conservation of energy for the speed

 

[mjolnir80]

im having problems dealing with the angle of the pendulum as it spins
if we have the y-axis in the direction of centrifugal force the sum of the forces would be:
ma = 400N - mgCos(angle)
could i consider the ball when its at a 90 degree angle to get rid of that thing
and at what point in the rotation would the maximum tension occur at anyways?