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JEE Main Physics question

PhysicsMotion in a PlaneJEE Main

A particle is projected from the ground at an angle of with the horizontal with an initial speed 20 ms. At what time after the projection will the velocity vector of the projectile be perpendicular to the initial velocity? ( ms)

Answer: 4

Solution

Using \dfrac{v}{g\sinθ}\dfrac{20}{10\sin30°}\dfrac{20}{5}$

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Question ID VK-158079