Do i just draw a simple water molecule? sketch a space filling model of a water molecule, show polarity by label positive and negatively charged regions of the molecule

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

What is created when solids,liquids,an gases mix with one another

What is the measure of a change in an objects velocity?