The natural resistance of any object to change its speed is called .

Can anybody me with this? ? (picture included.)

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Which body is in equilibrium? (1) a satellite orbiting earth in a circular orbit (2) a ball falling freely toward the surface of earth (3) a car moving with a constant speed along a straight, level road (4) a projectile at the highest point in its trajectory