No, not all balls move at the same speed. The speed of a ball depends on several factors, including its initial velocity, the force applied to it, and the resistance it encounters from the surrounding medium. For example, a ball thrown with greater force will move faster than a ball thrown with less force. Similarly, a ball moving through air will experience resistance, which will slow it down, while a ball moving through water will experience more resistance and slow down even faster. Additionally, the mass of the ball can affect its speed, with heavier balls generally moving slower than lighter balls.