1. spring rate

Please forgive me for I am simple.I am going to build a 35mm film camera and need to include a simple shutter mechanism.The question I can't answer is about spring rate and speed the shutter would be closed by the spring so it goes like this.
A spring attached to the shutter gate is stretched 1 inch for a force of 1 pound.The gate is released and the spring moves the gate to close the frame and end the film exposure.
IF THE SPRING RATE IS DOUBLED BY STRETCHING 2 INCHES WILL THE SHUTTER GATE MOVE TWICE AS FAST WHEN RELEASED?????
I am not including friction.
Thankyou to all in cyber space!

2. What kind of spring s it?

3. All other things being equal, and assuming its not a constant force spring, twice the force applied to the same mass will produce twice the acceleration.

4. As jboggs says twice the force.

The spring rate is 1 pound per inch of deflection regardless of the length that you stretch it until you exceed the useful working length.

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