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20. A mass attached to the end of a string oscillates like a pendulum with small amplitude. The mass has
horizontal velocity u₂(t) and vertical velocity (t). Which of the following could be a graph of the curve
(vz(t), vy(t)) over a complete oscillation?
vy(t)
(A)
(D)
vy(t)
Q
v₂ (t)
vy(t)
(B) 4
(E)
vy(t)
8
vy(t)
S
v₂ (t)
v₂ (t)
(C)
vy(t)
%
v₂ (t)

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