Answer:
The mass of the dog is 15 kg
Explanation:
We use the formula for the kinetic energy of the dog:
[tex]KE=\frac{1}{2} m\,v^2[/tex]
Then, in our case:
[tex]KE=\frac{1}{2} m\,v^2\\1080 \,=\,\frac{1}{2} m\,(12)^2\\m = \frac{2*1080}{144} \\m=15 \,\,kg[/tex]
