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In a Fourth of July celebration, a firecracker is launched from ground level with an initial velocity of 25.1 m/s at 30.1 from the vertical. At its maximum height it explodes in a starburst into many fragments, two of which travel forward initially at 20.1 m/s at 50.1 with respect to the horizontal, both quantities measured relative to the original firecracker just before it exploded.
With what angles with respect to the horizontal do the two fragments initially move right after the explosion, as measured by a spectator standing on the ground?
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