Rolling down a ramp - find acceleration

[serverxeon]

Here are the few equations i set up... which ultimately led to a wrong answer.
(In my solution, subscripts A refers to the ramp, B refers to the rolling pipe)

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I have a feeling that the acceleration if pipe A isn't simply downwards at 30deg.
Cos the ramp is rolling away, so the angle is relative to the ramp.

But I have no idea how to set up the required equations to correct this.
Any pointers?

 

[tiny-tim]

hi serverxeon!

I have a feeling that the acceleration if pipe A isn't simply downwards at 30deg.
Cos the ramp is rolling away, so the angle is relative to the ramp.

relative accelerations are vectors (like relative velocities or relative positions), and so they add like vectors