Why is it when Two students push against each other while sitting on skateboards. The student with more mass does not travel as far. This is best explained by newtons 2nd law of motion and not 1st law of motion. Explain in 1 sentence

The student with more mass experiences a greater force opposing their motion due to the stronger resistance force applied by the student with less mass, resulting in a shorter displacement, in accordance with Newton's second law of motion, F = ma.