First slide

Connected bodies

Question

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, the force which the rope exerts on the block is:

Easy

A

F/(M + m)
B

F
C

FM/(m + M)
D

zero

Solution

Acceleration of system = $= \frac{F}{m + M}$
Rope exerts Ma force on block which is equal to $= \frac{F}{m + M}$

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