From a window that is 20 m from the ground a stone with a speed of 10m / s is thrown vertically upwards. calculate: a) the maximum height reached and the time it takes to reach it b) the total time that is in the air

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 ?