: A model rocket is launched from the ground with an initial velocity of 62 feet per second. The formula for the height H of a projectile after time t is given by H=−1/2gt^2+vt+h, where g is the acceleration due to gravity, which on Earth is 32 feet per second squared in U.S. Customary units, v is the initial velocity, and h is the object's starting height above ground. How long does it take until the rocket returns to the ground? Enter the answer rounded to the nearest tenth of a second.