Physics for IGCSE & O level - Forces And Motion (Section 12 - No. 31)
Which of the following statements best describes a falling object when it reaches terminal velocity?
The object is no longer accelerating.
The force of gravity is zero.
The air resistance force equals the object's weight.
The object has reached its maximum speed.
Giải thích
Terminal velocity is reached when air resistance equals weight, and therefore, the object stops accelerating, so it moves at its maximum constant speed.