Justin and his friends are on the football team. they consider skateboarders at their school to be an out-group. what does this mean?

Suppose you use a machine that gives you a mechanical advantage of 2 to achieve an output force of 30newtons what must the input force be

What properties of a moving object are used in determining the object's energy of motion

The smallest particle of an element that retains its identity in a chemical reaction. true or false