If k=20 N/m and F=100 N, find x.

If x=0.03 m and k=300 N/m, find F.

In this problem F is the force acting on a spring with constant k. The force F creates a deformation, either by stetching or compressing the spring. Let x be this deformation.

The relation aming F, k and x is: F=k×x.

A. k=20N/m, F=100N.

x=F/k=100/20=5m

B. x=0.03m, k=300N/m

Fe=k×x=300×0.03=9N

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c. newton's third law of motion