Answer
The percent loss of the original kinetic energy decreases if the animal mass decreases.
Work Step by Step
In part (a), when the car hit a 500-kg animal, the percentage of the original kinetic energy that was lost in the collision was $~~33.3\%$
In part (b), when the car hit a 300-kg animal, the percentage of the original kinetic energy that was lost in the collision was $~~23.1\%$
We can see that the percent loss of the original kinetic energy decreases if the animal mass decreases.
