Question

the motion of six objects - a, b, c, d, e, and f - are represented by lines on a velocity-time graph. write the letter(s) for any object that changes its velocity at any time during the motion. if there are no instances of a changing velocity, then tap on the no answer button.

Explanation:

Step1: Identify constant velocity

Objects with horizontal lines (A, C) have unchanging velocity, since velocity does not vary with time.

Step2: Identify changing velocity

Objects with sloped lines (B, D, E, F) have velocity that changes over time, as the slope of a velocity-time graph represents acceleration (change in velocity).

Answer:

B, D, E, F