1.

A particle projected from ground moves at an angle 45∘ with horizontal one second after projection and speed is minimum two seconds after the projection. The angle of projection of particle is[Neglect the effect of air resistance]

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A particle projected from ground moves at an angle 45 with horizontal one second after projection and speed is minimum two seconds after the projection. The angle of projection of particle is

[Neglect the effect of air resistance]



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