Quais sao as áreas da física?

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 is the increase in density of a medium due to wave travel?

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false