# Question: When Velocity Is Zero What Is Acceleration?

## Can the speed of a person be negative?

The ratio of distance travelled and the time taken by a body can be zero but not negative.

Since distance and time are positive quantities and speed is obtained by the ratio of these two quantities, speed cannot be negative..

## Is velocity zero at the highest point?

Acceleration from gravity is always constant and downward, but the direction and magnitude of velocity change. At the highest point in its trajectory, the ball has zero velocity, and the magnitude of velocity increases again as the ball falls back toward the earth (see figure 1).

## What does it mean when velocity is 0?

Zero velocity is essentially no movement. What this means is that your change in position from time a to time b is zero. This happens when you throw an object to the sky. Just before it falls, when there is no force moving it upwards, it will remain motionless and its velocity will be zero.

## Is 0 a constant velocity?

Car 1 – Velocity and acceleration graphs Constant velocity means the acceleration is zero. The change in velocity over a certain time interval equals the area under the acceleration graph over that interval.

## Can velocity be negative?

The sign of the velocity depends on the coordinate system chosen to define the position. A positive velocity simply means that the object is moving in the positive direction, as defined by the coordinate system, while a negative velocity means the object is traveling in the other direction.

## What is the constant velocity?

Constant velocity means that the object in motion is moving in a straight line at a constant speed. … The velocity can be positive or negative, and is indicated by the sign of our slope. This tells us in which direction the object moves.

## Can we say that an object with zero velocity have acceleration?

Yes, it’s possible to have zero speed while accelerating, but only for an instant. … Acceleration is the rate at which an object’s speed and direction are changing with time, so whenever an object passes through zero speed as it reverses directions it has a non-zero acceleration but a speed of zero.

## Can you have a zero acceleration and nonzero velocity?

Answer and Explanation: Acceleration is the rate of change of velocity with time. As the velocity is a constant value over all the values of time, the rate of change of velocity is thus zero. So, acceleration is zero. So, zero acceleration and non zero velocity are possible for particles moving with constant velocity.

## Can average speed be zero?

Yes, average velocity of a moving body can be zero. Average velocity is displacement by time. So for example, if you are travelling in a circle, and come back to your initial point, displacement is zero.

## Does constant velocity mean no force?

If an object is moving with a constant velocity, then by definition it has zero acceleration. So there is no net force acting on the object. The total work done on the object is thus 0 (that’s not to say that there isn’t work done by individual forces on the object, but the sum is 0 ).

## Why the acceleration is negative?

According to our principle, when an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration. In Example D, the object is moving in the negative direction (i.e., has a negative velocity) and is speeding up.

## Why is net force zero?

The net force is the vector sum of all the forces acting on an object. When an object is in equilibrium (either at rest or moving with constant velocity), the net force acting on it zero. A vector can only have zero magnitude if all of its components are zero.

## What is an example of zero acceleration?

No acceleration means no change in velocity. For example an apple thrown in space. It will not stop moving or move at a different velocity. 1.1K views.

## Why acceleration is maximum when velocity is zero?

Acceleration is the rate of change of velocity. If you are accelerating,that means every second your velocity is changing. … So once you have reached your maximum velocity, that means your velocity can’t get any higher. So, your acceleration must be zero.