# Can an object have constant non zero velocity and changing acceleration?

## Can an object have constant non zero velocity and changing acceleration?

“An object has constant non-zero velocity and changing acceleration.” Not possible, acceleration is the change of velocity. For velocity to remain constant the acceleration must remain zero. If acceleration is changing it might be zero at some point, but will not remain zero, so the velocity will change.

## Is it possible to have a positive velocity and negative acceleration?

An object which moves in the positive direction has a positive velocity. If the object is slowing down then its acceleration vector is directed in the opposite direction as its motion (in this case, a negative acceleration).

What would happen if I had a positive velocity but a negative acceleration?

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.

Can a body change the direction of its velocity at constant acceleration?

1-Yes ,the direction of velocity can change while experiencing a constant acceleration. Like, in uniform circular motion there is a change in direction of the velocity and acceleration is constant in this case.

### What does negative image height mean?

The negative sign for the magnification, and the image height, tells us that the image is inverted compared to the object.

### Is object height always positive?

Answer: In a convex mirror, an image formed is always erect, thus the image height is taken as positive. In a convex mirror, the image formed is always behind the mirror, therefore the image distance is taken as positive.

Is object distance always positive?

Object distances are always positive. Real images are always inverted and virtual images are upright.

Is object distance positive for concave lens?

According to Cartesian sign convention, object distances (u) are always negative as the object is placed to the left of the mirror/lens. The focal length is positive for convex lens and mirrors. ‘f’ is negative for concave mirrors and lens. object distance is always negative for all the lens & mirrors.