1. Jul 20, 2010

### emma402

Can an object be moving when its acceleration is zero?
-it can for any length in time, correct?

And can an object be accelerating when its velocity is zero?
-it can, but only for one moment in time, correct?

2. Jul 20, 2010

### PhanthomJay

Yes and Yes.

3. Jul 20, 2010

### emma402

Jay can you look at my two other my recent post about ball acceleration/velocity and velocity of a ball please?

4. Jul 21, 2010

### Phy.man

for 1st question certainly yes..any thing consisting constant velocity has 0 acceleration..

And for second ques...well....i think its not possible

5. Jul 21, 2010

### the_storm

I think the 3st question and the second are correct
the first one when an object moving with constant velocity so it's acceleration is 0
the second question occurs in many cases for example when an object moving in the +ve x direction and its acceleration is negative so that means it is decelerating at a moment when he object changes direction the velocity will be zero and the acceleration will still constant

best regards :)

6. Jul 21, 2010

### Phy.man

the second question occurs in
many cases for example when
an object moving in the +ve x
direction and its acceleration is
negative so that means it is
decelerating at a moment when
he object changes direction the
velocity will be zero and the
acceleration will still constant
best regards :)
how can a decelerating object have a constant acc?

7. Jul 21, 2010

### the_storm

when it's initial velocity is positive and its acceleration is negative or vies versa.