Question

why does the rebounding collision result in a greater impulse? changing directions involves a greater velocity change than simply stopping. it happens over a shorter time. it takes longer. its actually less; mr. h made a mistake. rewatch

Explanation:

Impulse is equal to the change in momentum ($J = \Delta p=m\Delta v$). In a rebounding collision, the object changes direction, which means a larger change in velocity ($\Delta v$) compared to just stopping. A greater $\Delta v$ leads to a greater impulse when mass ($m$) is constant.

Answer:

Changing directions involves a greater velocity change than simply stopping.