13.80: a) Taking positive displacements and forces to be upwad, ( 29 , 2 , 2 x πf a ma mg n-= =-so ( 29 ( 29 ( 29 ( 29 . 2 cos 2 2 φ +-= t πf A πf g m n a) The fact that the ball bounces means that the ball is no longer in contact with the lens,
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