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A body is projected with a speed u at an angle @ with the horizontal. The speed of the body when it is at the highest point on its trajectory is sqr.rt(2/5) times its speed at half the maximum height. The value of @ is?

A body is projected with a speed u at an angle @ with the horizontal. The speed of the body  when it is at the highest point on its trajectory is sqr.rt(2/5) times its speed at half the maximum height. The value of @ is?

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