Is it B
May be I am wrong.
My intuition says that C is correct
Can you tell me what answer is given? @Navneet_2020
I am sure now answer is C
Please upload explanation.
Sorry I was having lunch.
So now focus on the lower block the only force that will cause motion of m_2 block is T( upon solving u will get T=20N)
So if F<25 then the whole system will be in rest.
f_2 will start increasing when T>5 or (F-5)>5N
If F-5>5 \implies F>10N