jee-main 2004 Q6

jee-main · India Projectiles Range and Complementary Angle Relationships
A projectile can have the same range $R$ for two angles of projection. If $T _ { 1 }$ and $T _ { 2 }$ be the time of flights in the two cases, then the product of the two time of flights is directly proportional to
(1) $1 / R ^ { 2 }$
(2) $1 / R$
(3) R
(4) $R ^ { 2 }$ 
A projectile can have the same range $R$ for two angles of projection. If $T _ { 1 }$ and $T _ { 2 }$ be the time of flights in the two cases, then the product of the two time of flights is directly proportional to\\
(1) $1 / R ^ { 2 }$\\
(2) $1 / R$\\
(3) R\\
(4) $R ^ { 2 }$
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