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3-2.Motion in Plane
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સમાન અવધિ ધરાવતા બે પ્રક્ષિપ્તકોણે પદાર્થને ફેંકતા ઊંચાઇ $h_1$અને $h_2$ મળે તો અવધિ $R$ કેટલી થાય?

A

$R = \sqrt {{h_1}{h_2}} $

B

$R = \sqrt {2{h_1}{h_2}} $

C

$R = 2\sqrt {{h_1}{h_2}} $

D

$R = 4\sqrt {{h_1}{h_2}} $

Solution

$\theta $ , $({90^o} – \theta )$

${h_1} = \frac{{{u^2}{{\sin }^2}\theta }}{{2g}}$ and ${h_2} = \frac{{{u^2}{{\cos }^2}\theta }}{{2g}}$

${h_1}\,{h_2} = \frac{{{u^2}{{\sin }^2}\theta \,{{\cos }^2}\theta }}{{4{g^2}}}$$ = \frac{1}{{16}}{\left( {\frac{{{u^2}\sin 2\,\theta }}{g}} \right)^2}$

$\Rightarrow \,16{h_{1\,}}{h_2} = {R^2}$

$\Rightarrow \,R = 4\sqrt {{h_1}{h_2}} $

Standard 11
Physics

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