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Created for Albert.io. Copyright 2016.

One end of an ideal spring with spring constant $k$ is attached to a lab table and the other end is attached to a block of mass $m$ as shown in the diagram above. A student picks up the block and holds it at a starting height above the table equal to the spring's unstretched length. The student then raises the block an additional distance $d$ before releasing it again.

Assuming the spring's mass is negligible, which expression below shows the block's momentum when it returns to its starting height above the table in terms of the given variables and fundamental constants?

A

$m\sqrt { 2gd } $

B

$d\sqrt { km } $

C

$\sqrt { md(2mg+kd) } $

D

None of these answers are correct.

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