Final answer:
The impulse corresponding to a change in momentum of 40 kg·m/s is also 40 Ns, which equals the momentum change since impulse and momentum change are directly related.
Step-by-step explanation:
The impulse experienced by an object is equal to the change in momentum of that object. Therefore, if the change in momentum is 40 kg·m/s, then the corresponding impulse is also 40 Ns. Option B (40 Ns) is the correct answer.
As a side example, using Newton's second law, we can find the change in momentum caused by a net force of 120 N acting on an object for 2 seconds. The formula for impulse, which equals the change in momentum, is impulse = force × time; which means the change in momentum would be 120 N × 2 s = 240 kg·m/s.