if the instantaneous velocity is zero is its acceleration zero?

Answer 1

No, no, no, no. And did I mention no? I cannot believe that three posters got this wrong. These people would have you believe that you stop accelerating at the top of a vertical jump - only if you're not accelerating, how do you start moving downward again? Utter madness.

Answer 2

Be careful which of these answers you believe. Something with a velocity of zero could have no acceleration or any other possible acceleration. If it is not moving and not changing velocity then it will have an acceleration of zero however it is not moving and either changing speed or direction it will have a changing velocity and hence it will be accelerating. For instance see the examples given in some of your answers about something thrown in the air. Pay no attention to your first few answers as they are possibly the most wrong answers I have seen given on this site.

Answer 3

Velocity & Acceleration depend on the frame of reference.
Consider a person simply standing on the ground. His velocity is zero according to another observer closeby. But he's still accelerating towards the center of the earth.

Answer 4

Acceleration depends on a change in velocity taking place in a certain period of time. Instanteous velocity happens during an infinitely small period of time, so t is taken to = 0; with t=0, there can be no change in the velocity, meaning no acceleration.

Answer 5

No. Acceleration maybe negative.Hmm i'll write an example below(t= time a=acceleration v=velocity:

t1 ; a= -5 v1= 10
t2; a= -5 v2 = 5
t3; a=-5 v3= 0

So as you can see,at the time t3 velocity is zero but acceleration is not.

Answer 6

a velocity of zero has no acceleration rate, in which the acceleration would be also zero, so yes.

Answer 7

Not necessarily. Consider a ball tossed into the air. At the top of its arc, the vertical velocity is obviously zero, but the vertical acceration is not.

Answer 8

if the velocity is constant (does not change) the acceleration is zero, of course.
Then if the velocity is zero and does not change the acceleration is also zero.

Answer 9

not necessarily

Answer 10

Chuck, once you're incorrect and someone corrects you, then you certainly should be grateful to him that he helped you advance your information. yet you're bashing him. at the same time as instantaneous speed is 0, it does not coach that acceleration should be 0. it ought to or received't be. the education given isn't adequate to locate the acceleration. Your argument is that 0 instantaneous speed proves 0 acceleration. evaluate the case of throwing an merchandise vertically upward. At optimal suitable, its instantaneous speed is 0 yet its acceleration isn't 0.