# As part of your work out, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that

As part of your work out, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when u push the platform, you compress the springs. You do 80.0G of work when u compress the springs 0.200m from their uncompressed length.
a) What magnitude of force must u apply to hold the platform in this position?
b) How much additional work must you do to move the platform 0.200m farther, and what maximum force must you apply?
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yagombyeR
a) The average force is , and the forceneeded to hold the platform in place is twice this, or 800 N.
b) Doubling the distance quadruples the work so an extra 240 J of work must be done. The maximum force is quadrupled, 1600N