(1 pt) Which of the following statements is true? (Give all correct answers, i.e., A, C, AE, ABCD . . .)

A) An object with a constant speed can not accelerate.
B) When the velocity is constant, the average velocity over any time interval can not differ from the instantaneous velocity at that instant.
C) If the acceleration of a body is constant as measured from a given reference frame, it is necessarily constant when measured from all other reference frames.
D) An object can have a zero velocity and still be accelerating.
E) The velocity of an object can reverse direction when its acceleration is constant.

1 answer

A. could be true if it stated "constant velocity" can not accelerate, but constant speed, false.
B. Yes, true
C. If another reference frame is accelerating, then not true from that accelerating reference frame.
D. yes, true. Thnk of a baseball thrown up, at the very top, veloicty is zero.
E. yes, again, consider the baseball thrown up.
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