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<p>Jawaban &nbsp;<strong>A. 50 N</strong></p><p>&nbsp;</p><p><strong>Pembahasan&nbsp;</strong></p><p>Luas penampang piston = πr² &nbsp; (luas lingkaran)&nbsp;</p><p>Jari-jari piston kecil, r₁</p><p>Jari-jari piston besar, r₂ = 40r₁</p><p>Berat mobil, F₂ = 80 kN = 80000 N</p><p>&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; F₁/A₁ = F₂/A₂</p><p>&lt;=&gt; F₁/r₁² = 80000/(40r₁)²</p><p>&lt;=&gt; F₁ = 80000/1600</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 50 N</p><p>&nbsp;</p>