Posted by **Mishaka** on Sunday, January 15, 2012 at 6:02pm.

A piece of elastic is attached to two nails on a flat board, with a button attached to the midpoint of the elastic. The nails are 5 cm apart. You stretch the elastic by pulling the button along the board in a direction that is perpendicular to the line between the nails.

A. Fnd an equation that relates the total length of the elastic x to the distance y that the button has moved.

B. You pull the button at a constant 3 cm/sec. Find the rate at which the length of the elastic is increasing when it is 12 cm long.

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