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=90+120=210n
b. f=f2-f1
b =120-90=30n
newtonnya itu di kurangkan, jadi 120 n–90 n=30 n ke arah Aliya..
b. sama
jumlah Newton itu di tambah... jadi 120 n+90n=210 n me arah itu.
Maaf ya Kalo salah