Rachel is running at 5 m/s when she suddenly gets a cramp and slows down to 1 m/s. if her acceleration was -50 m/s^2, how long did it take her to slow down?

An astronaut on the moon throws a baseball upward. the asatronaut is 6ft, 6in. tall, and the initial velocity of the ball is 30ft per second. the heigh s of the ball in feet is given by the equation s = -2.7^2 + 30t + 6.5, where t is the number of seconds after the ball was thrown. after how many seconds is the ball 16ft above the moon's surface?