An Object Attached to a Coiled Spring Is Pulled Down $\mathrm { a } = 10 ; \quad \mathrm { T } = 3 \pi$

question 99

Multiple Choice

An object attached to a coiled spring is pulled down a distance a from its rest position and then released. Assuming that
the motion is simple harmonic with period T, write an equation that relates the displacement d of the object from its rest
position after t seconds. Also assume that the positive direction of the motion is up.
- $\mathrm { a } = 10 ; \quad \mathrm { T } = 3 \pi$ seconds

• A) \(d = - 10 \cos \left( \frac { 2 } { 3 } \pi t \right)\)
• B) \(d = - 10 \sin \left( \frac { 2 } { 3 } \pi t \right)\)
• C) \(d = - 10 \cos \left( \frac { 2 } { 3 } t \right)\)
• D) \(d = - 3 \cos \left( \frac { 1 } { 5 } t \right)\)

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