Question

a small dog has a kinetic energy of 20 j while walking. which of these objects could also have a kinetic energy of 20 j? choose 1 answer: a a man standing still watching the dog b a man walking alongside the dog c a frisbee the dog is carrying in her mouth d a frisbee thats just been thrown for the dog to fetch

Explanation:

Kinetic energy is the energy of motion. An object with kinetic energy must be moving. A man standing still has no kinetic energy. A man walking alongside the dog, a frisbee the dog is carrying in its mouth (assuming it's not moving relative to the dog), have relatively low - speed and thus less likely to have 20 J of kinetic energy compared to a frisbee that's just been thrown. A frisbee that's just been thrown has significant speed and can have a kinetic energy of 20 J.

Answer:

D. a frisbee that's just been thrown for the dog to fetch