Posted by Danielle on .
I need help with this questions.
a). An overhead garage door has two springs, one on each side of the door. A force of 15 pounds is required to stretch each spring 1 foot. Because of a pulley system, the springs stretch only onehalf the distance the door travels. The door moves a total of 8 feet, and the springs are at their natural length when the door is open. Find the combined lifting force applied to the door by the springs when the door is closed.

Math 
bobpursley,
Hookes Law:
Forceeachspring=kx
=15/1 * x
and x will be 1/2 *8 
Math 
Anonymous,
f=60