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1.When a freight elevator that weights 1600lbs moves there is a frictional force of 100 lbs aciting on it. what force must be exerted on the elevator by its supporting cable if the maximum upward acceleration is to be 3ft/s?

Fg=-1600

g= -32 lb/ft^2

the answer is T=+1850 lb but i don't know how to get it at all......

2.an 80 lb crate is pushed across a floor from an angle of 30degrees downward with respect to the positive x-axis.... the co-efficient of friction between the crate and the floor is 0.58....what force would be required to make the crate move at a constant speed.......

the answer for this is Fa = 80lb

anyone know how to solve this??