Question

a ______ on a distance - time graph shows an object is moving back toward the starting poir vertical line curved line sloping up curved line sloping down horizontal line

Explanation:

• A vertical line on a distance - time graph means time is passing but distance is not changing (infinite speed which is not possible in reality).
• A curved line sloping up means the object is moving away from the starting point (distance is increasing with time).
• A horizontal line means the object is at rest (distance is not changing with time).
• A curved line sloping down means the distance of the object from the starting point is decreasing as time passes, i.e., the object is moving back toward the starting point.

Answer:

curved line sloping down