When a moving pulley is used to lift a 500N object at a constant speed, the pulling force F is () n, and the pulling force on the hook of the moving pulley is () n

When a moving pulley is used to lift a 500N object at a constant speed, the pulling force F is () n, and the pulling force on the hook of the moving pulley is () n

1) 500N/2=250N
2) 500N

A few questions about the physics of leverage balance
There are three!
Please tell me the reason!
Three in all!

When lever C is balanced, the moment of the big ball is M1 = F1 * L1, which is equal to the moment of the small ball M2 = F2 * L2 M1 = m2f1 > F2, and the moment of the two balls moving to the fulcrum at the same time is L = VT after T seconds. At this time, the moment of the big ball is Ma = F1 * (l1-l) and the moment of the small ball is MB = F2 * (l2-l) MA = F1 * (l1-l) = F1 * l1-f1 * l = m1-f1 * l, and MB = F2 * (L)