Which of the following has both kinetic and potential energy? A. A bug crawling on the ground
B. A ball rolling on the ground
C. A hot air balloon flying
D. A book sitting on a shelf
PLEASE HURRY

What is the momentum of a 2 kg object moving at 15 meters per second

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !