Answer:
1) force exerted by the cat overcomes the cat's inertia (N1L: Law of Inertia);
2) depending on the cat's mass, the force needs to accelerate (N2L: Law of Force and Acceleration);
3) when running, the cat applies a backward force onto the ground, and the ground applies the same amount of force (forward) back to the cat (N3L: for every action, there is an equal and opposite reaction).
Explanation:
