02quiz_11

02quiz_11 - v h v cos v sin v v h v cos v sin Physics 9A-C...

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Unformatted text preview: v h v cos v sin v v h v cos v sin Physics 9A-C Quiz #2 Name: key 4/8/11 ID(last 4): Arockisthrownfromtheroofofabuildingwithavelocity v atanangle fromthehorizontal. Thebuildinghasheight h .Ignoreairresistance. a)(8points)Findthespeedoftherockjustbeforeithitsthegroundandshowthatthespeedis independentoftheangle. Solution: a)Thespeedisthemagnitudeofthevelocity| v|= v x 2 + v y 2 (2pts) soweneedtofindthecomponentsofthevelocityjustbeforeishits theground. a x =0v x =v cos=constant.(2pts) Nowfindthe y-component: Wecoulduse v y =v sin- gt, butthenwewouldneedtoeliminate...
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