Q: A train approaching a crossing changes speed from 25 meters per second to 10 meters per second in 240 seconds how can the train's acceleration be described?

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accelerationThe rate at which velocity changes is called "acceleration".

Acceleration is the rate that speed changes.

acceleration

negative Acceleration

if the velocity is constant, the acceleration is zero. The acceleration is the rate at which the velocity changes, so if it stays the same, the car isn't accelerating.

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Acceleration can be described as the rate at which an object's velocity changes over time. It measures how quickly the object's speed or direction is changing. Therefore, it quantifies how much an object's motion is increasing or decreasing.

When force is constant and mass changes, acceleration is inversely proportional to mass. That means that as mass decreases, acceleration increases, and vice versa. This relationship is described by Newton's second law of motion, F = ma, where F is force, m is mass, and a is acceleration.

When velocity changes, it is referred to as acceleration. Acceleration is the rate at which the velocity of an object changes over time.

An increase in force applied to an object will result in an increase in acceleration, given that the mass remains constant. This is described by Newton's second law of motion, which states that acceleration is directly proportional to the force applied to an object. Conversely, a decrease in force will lead to a decrease in acceleration.

Acceleration

The concept of acceleration was first described by Galileo Galilei in the 17th century. He conducted experiments with rolling balls and inclined planes to study how the speed of an object changes over time. He formulated the equation for acceleration as a = Δv/Δt, where a is acceleration, Δv is change in velocity, and Δt is change in time.

'Velocity' means the rate at which position changes, and the direction in which it changes. 'Acceleration' means the rate at which velocity changes, and the direction in which it changes.

when it is acted on by a force

Acceleration

accelerationThe rate at which velocity changes is called "acceleration".

The quantities of motion are described by the concepts of speed, velocity, acceleration, and momentum. Speed is the rate of motion, velocity includes speed and direction, acceleration is the rate at which velocity changes, and momentum is the product of an object's mass and its velocity.

Changing direction is considered acceleration because acceleration is any change in an object's velocity, which includes changes in speed, direction, or both. So when an object changes direction, its velocity is changing, and this change in velocity is described as acceleration.