if you were helping Elon Musk with the next Space X Launch, which type of unit would you prefer to use, SI or US? Why?

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

Asap and show ! a 14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.