Need help if you can only do one question it’s fine just make sure to say which one you’re doing thanks

Avalue that describes how heavy an object is and is related to the force of gravity is

Aforce of 9.00 newtons acts at an angle of 19.0 to the horizontal. what is its component in the horizontal direction?

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?