Solution 15.3

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(New page: First find the impulse (change in momentum). <math>\begin{align} & \text{Impulse }=mv-mu \\ & 1200\times 15-1200\times 20 \\ & =-6000\text{ Ns} \end{align}</math> Use the formula ...)
Current revision (16:27, 27 March 2011) (edit) (undo)
 
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First find the impulse (change in momentum).
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4 tonnes = 4000 kg
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<math>\ \ cm = 4000</math>
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<math>\ \ u = 25</math>
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<math>\ \ v = 8</math>
<math>\begin{align}
<math>\begin{align}
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& \text{Impulse }=mv-mu \\
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& I=mv-mu \\
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& 1200\times 15-1200\times 20 \\
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& 4000\times 8-4000\times 25 \\
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& =-6000\text{ Ns}
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& =32000-100000 \\
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& =-68000\text{ Ns}
\end{align}</math>
\end{align}</math>
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Magnitude of the Impulse = 68000 Ns
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Use the formula
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<math>\text{Impulse }=Ft</math>
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<math>\begin{align}
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& -6000=F\times 20 \\
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& F=-300\text{ N} \\
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\end{align}</math>
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Current revision

4 tonnes = 4000 kg \displaystyle \ \ cm = 4000 \displaystyle \ \ u = 25 \displaystyle \ \ v = 8

\displaystyle \begin{align} & I=mv-mu \\ & 4000\times 8-4000\times 25 \\ & =32000-100000 \\ & =-68000\text{ Ns} \end{align}

Magnitude of the Impulse = 68000 Ns

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