To determine which of the two has the lower kinetic energy, we need to know their velocities, as kinetic energy is calculated using the formula:
\[ KE = \frac{1}{2} m v^2 \]
where \( KE \) is kinetic energy, \( m \) is mass, and \( v \) is velocity.
Without the velocities of the dog and the boy, we cannot definitively say who has lower kinetic energy based solely on their masses (63 kg for the dog and 51 kg for the boy).
If you have the velocities of both the dog and the boy, we can calculate their kinetic energies and compare them. If not, we cannot conclude which one has the lower kinetic energy just from their masses.
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