A particle is projected from ground at an angle such that it covers maximum horizontal distance on ground. In this case the angle between initial and final velocity vector is :

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θ = 4 5 ∘ Initial velocity: u at + 4 5 ∘ Final velocity : v at − 4 5 ∘ Angle between u and v : 4 5 ∘ + 4 5 ∘ = 9 0 ∘

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