Hi , i think all the block will be moving with the same acceleration and velocity. PF~ = ma projected on the x-axis . if they are lying on ground , but pulley problems , u must split the vectors i guess.
the concept of complex numbers was introduced , since , negative number , have no square or any kind of roots or cubes etc.. , there may be a point in space , which , is a root of a negative number (say) there fore it was introduced.
https://en.wikipedia.org/wiki/Relativistic_Doppler_effect
i had asked the question from both , maths and physics perspective , do u know a good book where i can learn , analytical geometry , perfectly . ??