Four ropes each attached to the end of a freight elevator are used to pull the small elevator upward through a wide elevator shaft of the forces list below which act upon the elevator

Hey hope you get the answer but i suck at math sorry : (

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Gravity, from the center of mass of the box, extending downward normal force, from the floor under the box, extending upward, equal to gravity push force, acting at a point on the box, extending in the direction of motion friction, acting at any point on the box directly opposite the push, extending directly opposite to the motion

Answer ( b )/furthest from the end prying out the nail