a woman throws her keys straight up at 8.49 m/s. her friend catches them and throws them 2.89 m higher. how long were the keys in the air?

An object is 10. cm from the mirror, its height is 3.0 cm, and the focal length is 2.0 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1.33 -1.33 +0.75 -0.75

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?

Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.