Two forces, 80n and 100n acting at an angle of 60 degrees with each other, pull on an object. what single force would replace the two forces?

We use the law of Cosines, resultant force

Here, and are forces acting at angle with each other.

Given , and .

Substituting these given values in above formula we get

.

Thus, the resultant force is 156 N.

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explanation:

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.