A toy rocket is launched vertically from ground level (y = 0 m), at time t = 0.0 s. The rocket engine provides constant upward acceleration during the burn phase. At the instant of engine burnout, the rocket has risen to 68 m and acquired a velocity of 90 m/s. The rocket continues to rise in unpowered flight, reaches maximum height, and falls back to the ground. The time interval, during which the rocket is in unpowered flight, is closest to:

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A toy rocket is launched vertically from ground level (y = 0 m), at time t = 0.0 s. The

rocket engine provides constant upward acceleration during the burn phase. At the

instant of engine burnout,...