what have you done in 4th step
how did you write in place of f net after differentation mdv/dt please explain
in example 3 rod and a circle in normal reaction 3 is equal in magnitude then why in example 4 ball a and ball b is not having the third law of motion at the point of normal reaction 3 and normal reaction 5?? please explain why we are not taking their magnitude.
what is quarks??