Question

Figure shows a three block system of masses m,
2m and 3m. The net contact force on 2m mass is
m
2m
3m

(1 mg
(2) 2mg
(3) 3mg
(4) Zero​

Answer 1

TRICK : here the whole system is moving with constant speed which means that he net force between an of them is 0

Taking the middle part only

Net force = T1 - T2 - 2mg

As the body is moving u , net force on that body provide motion

Therefore T1 - T2 - 2mg = 0

OR

consider the whole block

F - 6 mg = 0 -------- F = 6 mg

consider the first block

F - T1 - mg = m0 = 0 --------------- T1 = 5mg

for the last block

T2 - 3 mg = 0----------------------- T2 = 3mg

For the second block

T1 - T2 - 2mg = 5mg - 3mg - 2mg = 0

                          Hope you understand

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