A block of mass M is attached to the lower end of a vertical rope of mass m. An upward force P acts on the upper end of the rope. The system is free to move. The force exerted by the rope on the block is PM/(M+m)

Q: A block of mass M is attached to the lower end of a vertical rope of mass m. An upward force P acts on the upper end of the rope. The system is free to move. The force exerted by the rope on the block is PM/(M+m)

(a) In all cases

(b) Only if the rope is uniform

(c) In gravity-free space only

(d) Only if P > (M + m) g