Question

which of the following sea animals are accelerating? select all that apply. a jellyfish that is moving straight up to the surface of the ocean at a steady pace a sea urchin that is resting motionless at the bottom of an aquarium a stingray that is increasing its speed to escape a hammerhead shark

Explanation:

Acceleration is a change in velocity. Velocity is a vector quantity (has both magnitude and direction).

• The jellyfish moving at a steady pace has constant speed (magnitude of velocity) and direction (straight up), so no acceleration.
• The sea urchin at rest has zero velocity (constant), so no acceleration.
• The stingray increasing its speed (magnitude of velocity) has a change in velocity, so it is accelerating.

Answer:

a stingray that is increasing its speed to escape a hammerhead shark