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最後一句說要求平均阻力
那合力肯定不會是推進力 4 × 10⁴
而是 合力 = 推進力 - 阻力
同時要用 F = ma 算出合力
合力 F = ma
= 10⁴ × (10/5)
= 2 × 10⁴
推進力 - 阻力 = 2 × 10⁴
阻力 = 4 × 10⁴ - 2 × 10⁴
= 2 × 10⁴
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