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Introductory Physics Homework Help
Finding a rocket's speed at height h
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[QUOTE="meghanflowers, post: 6812063, member: 729811"] [B]Homework Statement:[/B] A rocket of mass m is launched straight up with thrust Fthrust. Find an expression for the rocket's speed at height h if air resistance is neglected. Express your answer in terms of the variables Fthrust , m , h , and appropriate constants. [B]Relevant Equations:[/B] vfs^2=vis^2+2Δs a=F/m I substituted 0 for vi, as the rocket is initially stopped. I am looking for Vf. So: Vf^2=0+2asΔs Vf^2=2asΔs I then substituted a=Fthrust/m So: Vf^2=2(Fthrust/m)Δs Δs at any given moment equals h so I substituted h for Δs. Then took the square root of both sides. Vf=sqrt(2h(Fthrust/m)) It says it is wrong, and that the correct answer includes the gravitational acceleration constant(g). I am really stuck. Thanks for helping! [/QUOTE]
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Introductory Physics Homework Help
Finding a rocket's speed at height h
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