A 5.0 N force directed to the west acts on an object for 2.0 seconds. What is the change in momentum of the object?

Do I have to divide 5.0 by 2.0 in order to get the momentum or multiply?

2 answers

No
if it acted for one second, the answer would be 5 N m West
for two seconds it is TWICE, not half.
F = rate of change of momentum
F = change in momentum / change in time

change of momentum = F * change in time