What is the sun’s declination on the fall equinox? a. 30 degrees n b. 90 degrees n c. 60 degrees s d. 0 degrees

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 ?