A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. if a force F is applied at one end of the rope, what is the force which the rope exerts on the block?

In your question that states that a block of mass M is pulled along the horizontal friction less surface by the rope of mass M and if the F force is applied at once, the ask is to find the force which the rope exerts on the block and the answer to this question is that the force is less than the Force applied.