90.A body is projected upward with velocity v at an angle of 30 degree with the horizontal, it is at the same height at times t1 and t2 then find the velocity of projection?

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Q. A body is projected with velocity u at an angle of projection

θ

with the horizontal. The direction of velocity of the body makes angle

30^{\circ}

with the horizontal at

t = 2 s

and then after

1 s

it reaches the maximum height. Then:

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v

at an angle of projection

θ

with the horizontal. The direction of velocity of the body makes angle

30^{\circ}

with the horizontal at

t = 2 s

and then after further

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, it reaches the maximum height. Then

(g = 10 {m/s}^{2})

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