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A 200 g model rocket is observed to rise 100 m above the ground after launch. What must have been the launch speed of the rocket at the ground?

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Conservation of Energy

[tex]Eki + Epi = Ekf + Epf\\ \frac{1}{2} mv^2 + 0 = 0 + mgh\\ v= \sqrt{ 2gh} =\sqrt{ 2(9.8)(100)}\\ v=88.5 m/s[/tex]

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