Two second after projection a projectile is travelling in a direction inclined at 30 o with horizontal, after one more second it is travelling horizontally. Angle of projection (in degree) with horizontal divided by 10 is.

Question

Two second after projection a projectile is travelling in a direction inclined at 30 o with horizontal, after one more second it is travelling horizontally. Angle of projection (in degree) with horizontal divided by 10 is.,

MARKS App · Accepted Answer

Let angle made by v → initially and after time t be θ and α respectively. tan ⁡ 30 o = u sin ⁡ θ - g × 2 u cos ⁡ θ …….…(i) tan ⁡ 0 o = u sin ⁡ θ - g × 3 u cos ⁡ θ …….…(ii) ∴ θ = 60 o

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