A rowboat passenger uses an oar to push the boat off the dock by exerting a force of 60.0 N for 2.0s. What impulse acts on the boat?

Impulse is the change of momentum of an object when the object is acted upon by a force for an interval of time. It is simply calculated by the expression:

Impulse = F (change in time)

Impulse = 60 (2)

Impulse = 120 Ns

Hope this answers the question. Have a nice day.