On a position vs. time graph for an object, a horizontal line segment indicates that the object is(1 point) moving at a constant rate.
moving at a constant rate.

at its starting location.
at its starting location.

not moving and is at rest.
not moving and is at rest.

located at ground level.

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

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?

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples