Acceleration is any change in velocity. Velocity is made up of a magnitude (the speed), and a direction. Velocity can change if the speed increases, if it decreases, or if the direction changes. For example, when a car goes around a curve, you feel the force of the acceleration.
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No, if velocity is increasing then acceleration cannot remain constant. Acceleration is the rate of change of velocity, so if velocity is increasing, then acceleration must also be changing to cause that increase in velocity.
Neither -- acceleration = 0 when the speed is constant.
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A constant speed has no acceleration. When an object is moving at a constant speed, its velocity remains the same over time, and there is no change in acceleration.
No, an object cannot be accelerating if it has constant velocity. Acceleration is the rate of change of velocity, so if an object has constant velocity, it is not accelerating.
When the velocity of a body is doubled, its acceleration remains the same if the direction of motion remains constant. Velocity is the rate of change of position of an object over time, while acceleration is the rate of change of velocity over time. If the velocity is doubled while the direction remains constant, the acceleration does not change.
velocity is the first derivative of motion, with acceleration being the second; if an object has a constant velocity, then it's acceleration is 0. This is easy to see from everyday life, when you are in a car, you only feel it jerk when you are accelerating but once you've reached your speed you feel nothing.
No, a particle cannot accelerate if its speed is constant. Acceleration is the rate of change of velocity, and if the speed (magnitude of velocity) remains constant, then the acceleration is zero.