Height of a Projected Ball An astronaut on the moon throws a baseball upward. The astronau...

Height of a Projected Ball An astronaut on the moon throws a baseball upward. The astronaut is 6 ft, 6 in. tall, and the initial velocity of the ball is 30 ft per sec. The height s of the ball in feet is given by the equation

where t is the number of seconds after the ball was thrown.

(a) After how many seconds is the ball 12 ft above the moon’s surface? Round to the nearest hundredth.

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(b) How many seconds will it take for the ball to return to the surface? Round to the nearest hundredth.