The net force determines how and if an object will

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

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

What would be the strength of earth's gravitational field at a point where an 80.0 kg astronaut would experience a 80% reduction in weight