americanjebus, what answer did you turn in? And let us know whether you get it right or wrong. I'm betting I'm right.
Let's hit this from a different angle.
Do you think that you can have acceleration when you are already at 100mph? SO for instance, if you accelerate from 0 to 200 mph, do you think that you are accelerating when you hit 100mph?
The only difference is the start and stop speeds... and as acceleration is a change in velocity, the start and stop speeds are irrelevant.
In other words, the only time that your acceleration is zero, is when your velocity is constant. If you are changing speeds, whether it's from 0 to 200, -100 to 100, or 0 to -200, your are always under acceleration.
Let's hit this from a different angle.
Do you think that you can have acceleration when you are already at 100mph? SO for instance, if you accelerate from 0 to 200 mph, do you think that you are accelerating when you hit 100mph?
The only difference is the start and stop speeds... and as acceleration is a change in velocity, the start and stop speeds are irrelevant.
In other words, the only time that your acceleration is zero, is when your velocity is constant. If you are changing speeds, whether it's from 0 to 200, -100 to 100, or 0 to -200, your are always under acceleration.