A student tries to raise a chain consisting of three identical links. Each link

Question

A student tries to raise a chain consisting of three identical links. Each link has a mass of 0.360 kg. The three-piece chain is connected to a string and then suspended vertically, with the student holding the upper end of the string and pulling upward. Because of the student's pull, an upward force of 13 N is applied to the chain by the string. The chain accelerates 2.2 m/s^2

Find the force exerted by the top link on the middle link.

What does this question mean? Is it asking for some sort of normal force? How do I find the answer?

Explanation / Answer

force exerted by the top link on the middle link=(0.360/2)*(2.2)=0.396N acc. of any link is same. so force acted by upper link by considering the lower link as separable part=(0.360/2)*(2.2)=0.396N

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