JAMB Physics 1991 Question 23

Question 23

Simple Harmonic Motion

A boy timed 30 oscillations of a certain pendulum thrice and obtained 1 min. 10 s, 1 min. 12 s and 1 min. 7 s respectively. The mean period of oscillation of the pendulum is

A.0.14 s
B.0.43 s
C.2.32 s
D.6.97 s

Show the answer and explanation

Answer: C (2.32 s)

Explanation

Mean time for 30 oscillations = (70 + 72 + 67)/3 ≈ 69.7 s. Period = 69.7/30 ≈ 2.32 s.