A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m.
A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. If a force P is applied at the free end of the rope, the force exerted by the rope on the block is
(a) Pm/(M+m)
(b) Pm/(M - m)
(c) P
(d) Pm/(M+m)
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