use Newtons 2nd law
both the masses are moving with same acceleration...by common sense...7 kg block is moving down.
lets consider forces acting on 5 kg block...
m(9.8)sin30
and
T...
as the 5 kg block is moving upward...t>m(9.8)sin30
therefore T-m(9.8)sin30=ma
do the same for block of...
the system is in equilibrium.
draw components of both the tensions...we get
T2sin30+T1sin45=ma...1
T2cos30=T1cos 45 ...2
solve de 2 eq. to get T1 and t2...
please correct me...if i m wrong...i m new here!