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Quelle est l’expression générale du vecteur accélération $\vec{a} (M / R)$ \vec{a} (M / R) dans une base fixe de $R (\vec{i}, \vec{j}, \vec{k})$ R (\vec{i}, \vec{j}, \vec{k})?

$\vec{a} (M/R) = \left(\frac{d^2x}{dt^2}\right) \vec{i} + \left(\frac{d^2y}{dt^2}\right) \vec{j} + \left( \frac{d^2z}{dt^2}\right) \vec{k}$ \vec{a} (M/R) = \left(\frac{d^2x}{dt^2}\right) \vec{i} + \left(\frac{d^2y}{dt^2}\right) \vec{j} + \left( \frac{d^2z}{dt^2}\right) \vec{k}

✅

$\vec{a} (M / R) = \left(\frac{x}{t}\right) \vec{i} + \left(\frac{y}{t}\right) \vec{j} + \left( \frac{z}{t}\right) \vec{k}$ \vec{a} (M / R) = \left(\frac{x}{t}\right) \vec{i} + \left(\frac{y}{t}\right) \vec{j} + \left( \frac{z}{t}\right) \vec{k}

❌

$\vec{a} (M/R) = \frac{1}{t} \vec{V} (M / R)$ \vec{a} (M/R) = \frac{1}{t} \vec{V} (M / R)

❌

$\vec{a} (M/R) = \left(\frac{dx}{dt}\right) \vec{i} + \left(\frac{dy}{dt}\right) \vec{j} + \left( \frac{dz}{dt}\right) \vec{k}$ \vec{a} (M/R) = \left(\frac{dx}{dt}\right) \vec{i} + \left(\frac{dy}{dt}\right) \vec{j} + \left( \frac{dz}{dt}\right) \vec{k}

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