Answer to Question 5

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  Frequency = 1/Period = 1/3 s = 0.33 Hz
 
 Use a = - (2pf )2 x = -(2 p 0.33 Hz)2   0.10 m = (2.07 rad s-1)2 0.10 m
 
  a  = 4.3 rad s-1 0.10 m = 0.43 m s-2