A rock is dropped from rest from a bridge and strikes the water in 5.0 sec. How high is the bridge? Write the distance as a positive number.

Most energy in an ecosystem comes originally from_

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 ?

What are the starting materials for nuclear fission? two small nuclei two large nuclei a neutron and a large nucleus a neutron and a small nucleus