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Q.

Two blocks of mass M1=20kg and M2=12 kg are connected by a metal rod of mass 8kg.The system is pulled vertically up by applying a force of 480 N as shown. The tension at the mid point of the rod is 

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a

144N

b

96N

c

240N

d

192N

answer is D.

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Detailed Solution

a=FM=480−(20+12+8)1020+12+8   = 2m/sec2 

T=[M2+mass of rod2](g+a)    =  (12+4)(12)   = 192N 

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