m=P1/g
m=120/10=12
P2=m(g-a)
80=12(10-a) |:4
20=30-3a
3a=10
a=10/3
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m=P1/g
m=120/10=12
P2=m(g-a)
80=12(10-a) |:4
20=30-3a
3a=10
a=10/3