Four forces act on an object such that the object is at rest. Three of the forces are given by F₁ = 21-2j, F₂=i-4j, F4 = −3i-5j. Determine F3 and its magnitude.
"\\vec F_1+\\vec F_2+\\vec F_4=-11\\vec j,"
"\\vec F_3=-\\vec \\Sigma=11\\vec j."
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