3-2.Motion in Plane
medium

क्षैतिज से $42^{\circ}$ तथा $48^{\circ}$ पर समान प्रारम्भिक वेग से प्रक्षेपित दो प्रक्षेप्यों का परास तथा ऊँचाई क्रमशः $R _{1}, R _{2}$ तथा $H _{1}, H _{2}$ हैं। सत्य विकल्प चुनिये।

A

${R}_{1}>{R}_{2}$ तथा ${H}_{1}={H}_{2}$

B

${R}_{1}={R}_{2}$ तथा ${H}_{1}<{H}_{2}$

C

${R}_{1}<{R}_{2}$ तथा ${H}_{1}<{H}_{2}$

D

${R}_{1}={R}_{2}$ तथा ${H}_{1}={H}_{2}$

(JEE MAIN-2021)

Solution

Range ${R}=\frac{{u}^{2} \sin 2 \theta}{{g}}$ and same for $\theta$ and $90-\theta$

So same for $42^{\circ}$ and $48^{\circ}$

Maximum height ${H}=\frac{{u}^{2} \sin ^{2} \theta}{2 {g}}$

${H}$ is high for higher $\theta$

So ${H}$ for $48^{\circ}$ is higher than ${H}$ for $42^{\circ}$

Standard 11
Physics

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