The Work $\overrightarrow { \mathbf { F } } _ { sp} \cdot d ~\overrightarrow { { x } }$

question 74

Multiple Choice

The work $\overrightarrow { \mathbf { F } } _ { sp} \cdot d ~\overrightarrow { { x } }$ done by the force exerted by the spring on a mass attached to the end of the spring when the mass has displacement d $\overrightarrow { \mathbf { x } }$ is

• A)always negative.
• B)always positive.
• C)negative half the time,positive the other half of the time.
• D)positive more than it is negative.
• E)negative more than it is positive.

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