Acceleration – The Physics Hypertextbook
Acceleration is the rate of change of velocity with time. An object accelerates whenever it speeds up, slows down, or changes direction.| The Physics Hypertextbook
Accelerating objects are changing their velocity - either the magnitude or the direction of the velocity. Acceleration is the rate at which they change their velocity. Acceleration is a vector quantity; that is, it has a direction associated with it. The direction of the acceleration depends upon which direction the object is moving and whether it is speeding up or slowing down.| www.physicsclassroom.com
Acceleration is the rate of change of velocity with time. An object accelerates whenever it speeds up, slows down, or changes direction.| The Physics Hypertextbook
Instantaneous acceleration ..., or the acceleration at a specific instant in time, is obtained by the same process as discussed for instantaneous veloci...| openstax.org
