Which of the following statements is true? Enter all correct statements (A, ACE,

Question

Which of the following statements is true? Enter all correct statements (A, ACE, BD, etc.). A) When the acceleration of a particle is zero, its average speed is equal to the magnitude of its average velocity. B) When the average velocity of a particle is zero, its average speed is also equal to zero. C) The speed of a particle with a positive acceleration is always increasing. D) The speed of a particle can never be negative. E) The average speed of a particle is equal to the magnitude of its average velocity.

Explanation / Answer

A) The speed of a particle with a positive acceleration is always increasing.
False: If velocity is in opposite direction to acceleration, speed will 1st decrease and then increase.

B) When the acceleration of a particle is zero, its average speed is equal to the magnitude of its average velocity.
True

C) When the average velocity of a particle is zero, its average speed is also equal to zero.
False
Average velocity = total displacement/time
Average speed = total distance/time
total displacement = 0 doesn't mean total distance is also 0.

D) The speed of a particle can never be negative.
True

E) The average speed of a particle is equal to the magnitude of its average velocity
False

Answer: BD

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