Which of the following types of motion are oscillatory? i.a diving board when used by a diver. ii. the motion of the balance wheel of a wrist watch. iii. the motion of the turn-table of a record player. iv. the motion of the center of a ten kobo piece as it rolls down an inclined plane. v. the motion of the needle of a D.C. ammeter into which a low A.C. current is passed

A. i and ii  
B. i, ii and iii
C. ii, ii and iv
D. i, ii and v
E. iii, iv and iv

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Correct Answer: A