Question

help me guys....!
answer with description...​

Answer 1

Whole system moves with acc 'a'

On 20kg:

80-t=20a

t=80-20a                       -----(1)

On 10kg:

t-20=10a

t=10a+20                      ------2

Using 1 and 2

10a+20=80-20a

30a=60

a=2m/s²