Physics for IGCSE & O level - Forces And Motion (Section 7 - No. 21)
Which of these statements are true about the acceleration of an object?
Acceleration only occurs when the forces are balanced.
Acceleration is the rate of change of velocity.
Acceleration can occur in both speed up and slow down.
Acceleration can only occur when the speed increases.
Объяснение
Acceleration is the rate of change of velocity. Acceleration can occur whether an object speeds up or slows down.