This problem is about Newton's 2nd Law. A lift cable can withstand a tension of 18,000N before snapping. The empty lift has a mass of 500kg and the maximum acceleration of the lift is 2.25 m/s2. If safety regulation state that the cable should never experience a force greater then two thirds of its breaking tension, how many 65kg people can safely travel in the lift.

Using Newton's 2nd Law: An elevator cable (PhysCasts)

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Using Newton's 2nd Law: An elevator cable (PhysCasts)

Using Newton's 2nd Law: An elevator cable (PhysCasts)