Suppose a ball had a potential energy of 5 j when you dropped it. what would be its kinetic energy just as it hit the ground. (ignore the effect of air resistance)

Aheavy boy and a lightweight girl are balanced on a massless seesaw. the boy moves backward, increasing his distance from the pivot point. what happens to the seesaw? it is impossible to predict without knowing additional information. the side the boy is sitting on will tilt downward. the side the girl is sitting on will tilt downward. nothing; the seesaw will remain balanced.