Two blocks of mass 1,2kg rest .the2kg block is pulled by force F ,Tensions T in the streng is
If the blocks are horizontal then,
F. = 3a
T = F - 2a
T= 1a
Therefore, T= F/3.
If the blocks are aligned vertically with the 1 kg block on top attached to a string, then
F= T - 2g
T= T1 - 1g
Therefore, T= F+2g
T1= F+3g.
Hope that helps.