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Answered 2011-08-31 09:12:40

no because acceleration can be negative due to decreasing of velocity so its not possible

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Yes. An object slowing down but still moving in a positive direction has a positive velocity but a negative acceleration.

An object moving in relation to another object. It can be either positive or negative.

No. Velocity is the change in position over time. So if the velocity is negative, then the change in position must be negative - unless time is moving backwards.

No. The velocity of an object is how fast it is moving as well as the direction of the motion. So when considering one dimension, the velocity can be positive or negative. The speed of the object is simply the magnitude (absolute value, in the case of one dimension) of the velocity, with no direction. Acceleration is the change in velocity and does include direction. So if an object has a positive velocity (in one dimension) and its speed increases, the acceleration is negative. However, if the speed of an object moving the negative direction increases, then the acceleration is negative, because the velocity becomes "more negative."

It depends on what information you have. Also, velocity can be negative - it just means that the object is travelling in the direction opposite to the positive direction for the velocity vector.

It's positive in the direction of the greater one, and negative in the direction of the smaller one.

The velocity has changed from positive to negative, or vice-versa.

Yes, velocity is the integral of acceleration and their signs at any given time are independent.

if the velocity is positive to start with it changes direction when the velocity is less than zero; that is, when it is negative.

Yes. Since velocity is a vector it can have negative values when the object is moving in the direction opposite to the direction defined as the positive direction. For example, if an object is thrown vertically upwards and the upward direction is considered the positive direction, then when the object is falling downwards under gravity, its velocity is negative (in the upward direction). Coversely, if the downward direction is defined as the positive direction, then the object has a negative velocity during the first stage of the trajectory.

In this case, acceleration is positive. Negative acceleration would cause the object to slow down (decelerate.)

Yes. A car that brakes is slowing down and therefore has negative acceleration, but is still moving forward a therefore has positive velocity because it cant all of a sudden stop.

Yes, velocity can be negative. Velocity is a vector, which means that it specifies a speed and a direction. However, whether it's negative depends on how the coordinate system is defined. If the right hand side is defined as being positive, then an object traveling to the right has a velocityv.If that object begins traveling to the left, it has a velocity of -v.

Well velocity is basically the same thing as speed but with direction (velocity can be negative or positive and speed is always positive). l velocity l = speed So a change in velocity means a change in speed.

It means that an object with a negative average velocity is moving in the opposite direction (of course according to the chosen positive direction of the predefined frame).

A negative slope, called 'a negative gradient' by the intelligent, on a Velocity-Time Graph shows the deceleration of the object. This negative gradient is the positive deceleration and the negative acceleration.

An object with constant velocity has no acceleration.

This was the essential question on a homework assignment. Speed tells how fast an object is moving but it does not tell the direction. Velocity tells how fast an object is moving and it also tells the direction. When velocity is positive, the object is moving up. When velocity is negative, the object is moving down.

When we throw the object upwards we consider that upward direction as positive. Therefore, the velocity in that direction is positive but the acceleration due to gravity is in the opposite direction and so it is considered negative. But when the ball comes down again after reaching a certain height the velocity is in opposite direction to the earlier one and so the velocity now is negative as a result the acceleration is again negative.

Observe that the object below moves in the negativedirection with a changing velocity. An object which moves in the negative direction has a negative velocity. If the object is speeding up then its acceleration vector is directed in the same direction as its motion (in this case, a negative acceleration).

It accelerates in the opposite direction. Its velocity increases in the opposite direction to the direction that has been assigned positive.

Yes, "velocity" is a vector so it not only has magnitude but also direction. By convention, an object moving from left-to-right or upward is moving in a positive direction while an object moving right-to-left or downward is moving in a negative direction. "Speed" is a related term but it is a scalar. As such, it has only magnitude. A speed cannot be negative.

Quite simply, this means that momentum is a vector quantity; the direction is relevant. This is useful, for example, for calculations involving the conservation of momentum. Actually momentum is the product of velocity and mass, and velocity is also a vector quantity - thus, in this example, one object will have a positive velocity (more precisely: a positive component of the velocity along the x-axis, for example), the other, negative. Multiplying this velocity by the mass will also give a quantity which may be positive or negative (or rather, have positive or negative components).

Acceleration is negative if velocity is decreasing with time. Since velocity is a vector this can occur in one of two ways: 1) you are slowing down in the direction of motion and the velocity in that direction is defined as positive (this is what we usually mean by negative acceleration) 2) you are speeding up in the direction of motion and the velocity in that direction is defined as negative. An example of this is an object launched into the air which immediately starts to decelerate in it's upward velocity, reaches it's highest velocity, and then begins accelerating towards the ground. If we call the velocity upward a positive velocity, then when it starts falling, it has negative velocity. Note that acceleration (due to gravity) is negative the whole time.