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A block of mass is pulled along a horizontal frictionless surface by a rope of mass . If a force is applied at the free end of the rope, the force exerted by the rope on the block is:

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answer is A.

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Detailed Solution

Concept: Formula Used: Newton’s second law of motion = External Force applied to the system = (Mass of the system) ×(Acceleration of the system).
Taking the rope and the block as a system
Question Image

The acceleration of the (rope +block) system is given by

.
So, the force on the block of mass

is equal to

Hence, option 1 is correct.

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