Impulse
Impulse is the change in momentum of an object. It's calculated as:
* Impulse (J) = Force (F) * Time (Δt)
The Scenario
You're given:
* Force (F) = 10 N
* Time (Δt) is doubled.
The Effect on Impulse
Since impulse is directly proportional to time, if you double the time the force acts, you double the impulse.
In Conclusion
If the same force of 10 N acts on a cart for twice the time, the impulse will be twice as large.