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~luas daerah bag.atas berbentuk trapesium
W1= [(jumlah sisi sejajar)×t] / 2
W1= [(6+8)×6] / 2
W1= (14×6) / 2
W1= 84 / 2= 42 J
~luas daerah bag.bawah berbentuk segitiga
W2= (alas×tinggi) / 2
W2= (5×(-2)) / 2
W2= (-10) / 2= -5 J
~usaha total
Wtot= W1+W2
Wtot= 42 + (-5)
Wtot= 37 J