What are the two forces involved when a machine is used? -friction and density -potential and kinetic -input and output

Question

What are the two forces involved when a machine is used?
-friction and density
-potential and kinetic
-input and output
-gravity and friction

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Yến Oanh 3 years 2021-07-20T14:58:38+00:00 1 Answers 12 views 0

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    2021-07-20T14:59:46+00:00

    Potential and kinetic I believe

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )