A-tennis-ball-is-thrown-vertically-upward-with-an-initial-velocity-of-50m-s-when-the-ball-return-to-the-point-of-projection-it-renounce-with-the-velocity-of-2-3-of-the-velocity-Calculate-the-hei

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Question Number 10736 by Saham last updated on 23/Feb/17

$$\mathrm{A}\mathrm{tennis}\mathrm{ball}\mathrm{is}\mathrm{thrown}\mathrm{vertically}\mathrm{upward}\mathrm{with}\mathrm{an}\mathrm{initial}\mathrm{velocity}\mathrm{of}$$$$50\mathrm{m}/\mathrm{s},\mathrm{when}\mathrm{the}\mathrm{ball}\mathrm{return}\mathrm{to}\mathrm{the}\mathrm{point}\mathrm{of}\mathrm{projection}\mathrm{it}\mathrm{renounce}$$$$\mathrm{with}\mathrm{the}\mathrm{velocity}\mathrm{of}\frac{2}{3}\mathrm{of}\mathrm{the}\mathrm{velocity}.\mathrm{Calculate}\mathrm{the}\mathrm{heigth}\mathrm{after}\mathrm{renounce}.$$

Answered by mrW1 last updated on 24/Feb/17

$$\frac{1}{2}{mV}_2^2=mgh$$$$\Rightarrow h=\frac{V_2^2}{2g}=\frac{{\left(\frac{2}{3}\times 50\right)}^2}{2\times 9.81}=56.6m$$

Commented by Saham last updated on 24/Feb/17

$$\mathrm{God}\mathrm{bless}\mathrm{you}\mathrm{sir}.$$

Commented by chux last updated on 25/Feb/17

$$\mathrm{please}\mathrm{mrw}1\mathrm{are}\mathrm{you}\mathrm{also}\mathrm{known}\mathrm{as}$$$$\mathrm{Ise}$$

Commented by mrW1 last updated on 25/Feb/17

$$no.anotheridihaveusedismrW.$$

Commented by chux last updated on 25/Feb/17

$$\mathrm{ok}\mathrm{sir}$$

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