Why does the upward force exerted on the elevator by the cable have the same magnitude as the downward force of gravity on the elevator? (poll 11005441)

Why does the upward force exerted on the elevator by the cable have the same magnitude as the downward force of gravity on the elevator?

(a) Because of Newton’s first law

(b) Because of Newton’s third law

(c) Both (a) and (b)

Other:

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