A vertical rocket has mass \(10,000\ \text{kg}\), thrust \(150,000\ \text{N}\) and drag \(20,000\ \text{N}\). The instantaneous acceleration (in \(\text{m/s}^2\)) is
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For a vertically ascending rocket,
\[
\boxed{
a=\frac{T-D-mg}{m}.
}
\]
Always subtract both the drag force and the weight from the thrust before dividing by the mass.