Review
Part A
The unstretched length of a spring depends on the force in the spring, F, the spring constant, k, and the actual length of the connected spring in the mechanism, s'. To determine the unstretched length of a spring, once the force in the spring has been calculated, it equals:
$$s' + F/k$$
$$F \cdot k$$
$$F/k$$
$$s' - F/k$$
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