A dog chasing a cat has 0.53 times the kinetic energy of the cat, and the cat has 0.44 times the weight of the dog. The dog speeds up by 0.87 m/s and then has the same kinetic energy as the cat. What was the original difference in speed of the dog and cat? In other words, what is Vcat - Vdog initially (before the dog speeds up)? (Ucat - Vdog); = m/S