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dybincka [34]
3 years ago
5

What is the impulse needed to stop a 45-kg boy who is running at 6 m/s in 3 seconds?

Physics
1 answer:
Tju [1.3M]3 years ago
6 0
Impulse = change of momentum
Impulse = 45 x 6 = 270 Ns
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\\ \rm\Rrightarrow \dfrac{1}{u}+\dfrac{1}{v}=\dfrac{1}{f}

\\ \rm\Rrightarrow \dfrac{1}{u}=\dfrac{1}{-10}+\dfrac{1}{38}

\\ \rm\Rrightarrow \dfrac{1}{u}=\dfrac{-19+5}{190}

\\ \rm\Rrightarrow \dfrac{1}{u}=\dfrac{-14}{190}

\\ \rm\Rrightarrow u=\dfrac{190}{-14}

\\ \rm\Rrightarrow u=13.6cm

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A 7300 kg rocket blasts off vertically from the launch pad with a constant upward acceleration of 2.20 m/s2 and feels no appreci
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= 575 + 129.08

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