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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Physics
Chapter
Motion in Two Dimensions

NTA Abhyas 2020 · Physics · Motion in Two Dimensions

Two second after projection a projectile is travelling in a...

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

Correct answer

6

Step-by-step solution

Let angle made by v→\overset{\to}{v} initially and after time t be θ\theta and α\alpha respectively.
tan30o=usinθ−g×2ucosθtan {30}^{o} = \dfrac{usin \theta - g \times 2}{ucos \theta}…….…(i)
tan0o=usinθ−g×3ucosθtan {0}^{o} = \dfrac{usin \theta - g \times 3}{ucos \theta} …….…(ii)
∴θ=60o∴ \theta = {60}^{o}
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