Question

Which of the following is an example of something that undergoes acceleration while moving at a constant speed?

1.A man standing in an elevator

2. A car making a circle in a parking lot

3. None of these. An object that undergoes
an acceleration has to change its speed

4. A football flying in the air

5. A car moving straight backwards on the
road

Answer 1

A car making a circle in a parking lot is accelerating even when it's
moving with constant speed, because its direction is constantly
changing, and that's a form of acceleration.

Answer 2

Acceleration is a vector quantity which means that its takes into account both the magnitude and direction. Any change of the magnitude or direction of the velocity would cause an acceleration. The (2) the car constantly changes its direction and (4) the football would change its velocity because of the pull of gravity.