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(Part 1) A projectile is thrown from a point O on the ground at an angle 45 degrees from the vertical and with a speed of 5(2)^(1/2)m/s. The projectile at the highest point of its trajectory splits into 2 equal parts. One part falls vertically to the ground, 0.5s after the splitting. The other part, t seconds after the splitting, falls to the ground at a distance x meters from the point O. The value of t=? (g=10m/s^2)

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