Okay the fourth one seemes a little weird but I assume they are asking for the maximum or minimum force to be applied are when there are no people on it....cuz otherwise it's a very vague question
The maximum force required would be when the lift is moving up with maximum acceleration
Force-48500=4850X0.068
F=48829.88N
The minimum force to be applied on the cable would be when the elevator is decelerating at -0.068./s2
This wouldbe F-48500=4850X-0.068
F=48170.2N
I assume it is done this way but I'm still not sure whether the question wants this