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## How do you know if an object is speeding up?

**If acceleration points in the same direction as the velocity**, the object will be speeding up. And if the acceleration points in the opposite direction of the velocity, the object will be slowing down.

## How do you know if something is speeding up or slowing down?

Speeding Up and Slowing Down

If **the velocity and acceleration are in the same direction** (both have the same sign – both positive or both negative) the object is speeding up. If the velocity and acceleration are in opposite directions (they have opposite signs), the object is slowing down.

## How do you tell if an object is speeding up or slowing down on a position graph?

**If the V-T line has a negative slope, the object is undergoing acceleration in the negative direction.**

- If v is positive, the object is slowing down.
- If v is negative also, the object is speeding up.

## At what time is the particle speeding up?

A particle usually speeds up **when the velocity and the acceleration have the same signs**. It slows down when the acceleration and velocity signs are different.

## What is retardation How does it affect the speed?

Retardation is **the acceleration which acts opposite to the direction of the motion of the body** which causes decrease in the velocity of the moving body. Thus it slows down the moving body.

## What graph shows an object speeding?

**Speed-time graphs**

A sloping line on a speed-time graph represents an acceleration . The sloping line shows that the speed of the object is changing. The object is either speeding up or slowing down. If the line slopes upward from left to right, this means the object is speeding up.

## At what point is a car decelerating?

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In the same way that velocity is the rate of change of displacement, acceleration is the rate of change of velocity. In other words, whenever a car increases its velocity, it is said to be accelerating and **whenever it is slowing down**, it is said to be decelerating.

## How do you find velocity from speed?

For vector calculus, it is the magnitude of the velocity. Let r(t) be a differentiable vector valued function representing the position of a particle. Then the speed of the particle is the magnitude of the velocity vector. **Speed=||v(t)||=||r′(t)||**.

## What increases velocity?

definition. When the velocity of an object changes it is said to be **accelerating**. Acceleration is the rate of change of velocity with time. In everyday English, the word acceleration is often used to describe a state of increasing speed.

## Does velocity increase as an object goes up?

When you project an object upward and release it at its initial velocity, it is moving in the opposite direction of the force of gravity. The object slows down as it moves upward until it reaches a maximum height, at which time the velocity is zero. Then the **velocity increases as the object falls toward the ground**.