An Object Attached to a Coiled Spring Is Pulled Down $$\mathrm { a } = 5 ; \quad \mathrm { T } = 10 \text { seconds }$$

question 45

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.
- $$\mathrm { a } = 5 ; \quad \mathrm { T } = 10 \text { seconds }$$

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

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