The Block B will have its own weight as downward force and Tension as upward force.
For block A only tension is pulling force
writing force equations for both by newtons 2nd law
T = m1*a
m2*g - T = m2*a
solving these two equations we get
a = m2*g/(m1 + m2) = 4.354 m/s
T = m1*m2*g/(m1 + m2) = 18.59 N
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