A mass is attached to a horizontal spring, and resting on a frictionless surface

Question

A mass is attached to a horizontal spring, and resting on a frictionless surface is free to oscillate back and forth. Suppose the spring is stretched a distance 2d from equilibrium, and released. As the mass passes through the origin, how does its speed compare to the same mass and spring if stretched initially only a distance d from equilibrium?

a. square root of 2 times greater

b. two times smaller

c. square root of 2 times smaller

d. two times greater

I believe its D but I'm an idiot when it comes to physics and the professor doesn't teach

Explanation / Answer

it is d) two times greater

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