Initially (at time t = 0) a particle is moving vertically at 5.8 m/s and horizontally at

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Initially (at time t = 0) a particle is moving vertically at 5.8 m/s and horizontally at 0 m/s. Its horizontal acceleration is 2.1 $m/s 2$ . At what time will the particle be traveling at 54 with respect to the horizontal? The acceleration due to gravity is 9.8 m $/s 2$ .