Sarah throws the ball a second time, straight up in the air with an initial velocity of 19.62 m/s. However, this time she lets the ball land on the floor, 1.00 m below where she threw the ball from. How long will the ball be in the air before it hits the floor?

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.