Physics > 2010 > 12
WASSCE
A vertical string, suspended from a fixed point and having a small mass attached to the free end is set into oscillations. Which of the following statements about the system are correct?
I. The potential energy of the mass is a minimum at the middle of the swing.
II. Its kinetic energy is a maximum at the middle of the swing.
III. The sum of the potential and kinetic energies is constant throughout the swing.
I. The potential energy of the mass is a minimum at the middle of the swing.
II. Its kinetic energy is a maximum at the middle of the swing.
III. The sum of the potential and kinetic energies is constant throughout the swing.
A.
I, II and III
B.
I and II only
C.
II and III only
D.
I and III only
Answer: C
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