Question

Manuel and Sandy were partners. Sandy held the accelerometer in her hands while Manuel watched the water line. Throughout Sandy's walk, the water line remained level. What does that tell the students about Sandy's motion?

A) Sandy's velocity changed when she slowed down or sped up.

B) Sandy's speed might have changed but her direction did not.

C) Sandy must not have been moving if the water line remained level.

D) Sandy's velocity is constant: her speed and direction did not change.

Answer 1

The level water line seen during Sandy's walk indicates that she maintained a constant velocity throughout her motion, meaning her speed and direction did not change. Therefore correct option is D

Step-by-step explanation:

If Sandy's walk resulted in the water line remaining level, it indicates that Sandy moved with uniform velocity. This means that while she might have changed her speed during the walk, there was no acceleration as there was no change in velocity in terms of both magnitude and direction. Since the accelerometer measures acceleration and the reading was level, we can infer that her velocity was constant. Therefore, the correct answer is D) Sandy's velocity is constant: her speed and direction did not change.