The speed of a particle is always positive.
B) The acceleration of a particle can be non-zero when its speed is constant.
C) The average speed of a particle is equal to the magnitude of its average velocity.
D) The speed of a particle with a positive acceleration is always increasing.
E) When the acceleration of a particle is zero, its average speed is equal to the magnitude of its average velocity.
F) The velocity of an object can reverse direction when its acceleration is constant.
G) When the average velocity of a particle is zero, its average speed is also equal to zero.