Find the force required to do 25 joule work when the force causes a displacement of 0.5 m

The slope of a velocity time graph over any interval of time gives the during that interval

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water

What is the difference between mass density and weight density?