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Mr. X of mass 80 kg enters a lift and se...

`Mr. X` of mass `80 kg` enters a lift and select the floor he wants .The lift now acceleration upwards at `2 ms^(-2)` for `2 s` and then moves with constant velocity .As the lift approaches his floor ,it decelerates at the same rate as it previously accelerates .If the lift cabes can safely withstant a tension of `2 xx 10^(4) N` and the lift itself has a mass of `500 kg` ,how many `Mr.X' s` could it safely carry at one time?

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