disappearing and reappearing

i have u shaped  ramp (bitmap) , have ball (motion tweened) shape, rolling down. tree ( bitmap) kept somewhere on ramp , need ball

1) begin disappearing /going out of sight approaches tree and  out of sight period  behind tree

2) still number 1 specify ball stay x period of secs before comes out behind tree

 

-many helping me this. beginner , have looked @ tutorials unable this.

convert tree vector (select it>click modify>trace bitmap) can remove background.  place vector on layer above tweened ball layer.

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