Which of the following represent an accelerated motion? List all that apply..?

Question

A. An object that turns around and changes motion
B. An object which changes direction
C. An object moving at a constant speed in the same direction
D. An object which remains at rest
E. An object moving in a cirlce at constant speed
E. NONE

Answer 1

In physics or physical science, acceleration (symbol: a) is defined as the rate of change (or derivative with respect to time) of velocity. It is thus a vector quantity with dimension length/time². In SI units, acceleration is measured in meters/second² using an accelerometer.
Or
Things are accelerating if they are changing speed or direction.
Are they doing this?
A - Yes (turning is changing direction)
B - Yes
C - No
D - No
E - Yes ((turning is changing direction)

Answer 2

a, b, e
in all cases the direction of the velocity changes and thus there was an outside force.

Answer 3

a,b,e