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Question

Two blocks of masses 7kg and 5kg respectively are connected by a heavy rope of mass 4kg. An upward force of 200N is applied as shown in the diagram. The tension at the top of heavy rope at point P is: (g=10m/s2)

280782_95be1e4332bb4598a5acf50b4eef5e11.png

A
2.27N
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B
112.5N
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C
87.5N
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D
360N
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Solution

The correct option is B 112.5N
first we have to calculate resultant force to calculate acceleration of the system
Fmg=ma
where m is the mass of whole system
20016×g=16a
a=2.5m/s2
now tension at point P is
Tmg=ma
here m is the mass of the string and lower block
T=9×g+9×2.5=112.5N

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