Alguém pode me ajudar???

Agroup of students were investigating the force of gravity. they began by dropping a foam ball from a height of 3 meters into a bucket of sand. the ball hit the sand in 0.306 seconds. they dropped additional balls of approximately the same diameter, but of different masses. here is the data they collected. based on this experiment and the collected data, what would their conclusion be?

You notice the birds sitting on the electrical wires which of the following explain why the birds don't get shocked

What energy transformations occur each time the skateboarder rolls up the ramp?