What is acceleration? Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity. The velocity of a moving object can increase or decrease.when an object begins to slow down is called negative acceleration or deceleration.

What is the difference between speed, velocity and acceleration?
Speed can be measured in a numerical value of how fast or slow an object is moving. Velocity measures the rate at which an object is changing its position in the direction the object is moving. Velocity is a vector quantity because it consists of two characteristics; it has a numerical AND a directional value.
Speed= Distance divided by Time
Velocity= Change in Distance divided by Change in Time
Acceleration = Change in Velocity divided by the Change in Time

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