You throw a ball straight upward from a point that is 0.9 m from the ground.  If the ball reaches a maximum height of 5.3 m from the initial position, calculate the time (in s) it takes the ball to return to 0.9 m.

(a) Calculate the height (in m) of a cliff if it takes 2.19 s for a rock to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.06 m/s. (Enter a number.) 5.8 m (b) How long (in s) would it take to reach the ground if it is thrown straight down with the same speed? (Enter a number.)

A baseball player catches a ball 9.4 s after he throws it vertically upward. Assuming he caught it at the same height he threw it from, what maximum height did it reach?

A ball dropped from a height of 2.0 m above the ground takes a certain time, t, to reach the ground. How long would a ball dropped from a height of 8.0 m take to reach the ground?