Impulse question.. plz Help !

[kabtq9s]

(sorry for the oversized images)

This is from a Kaplan FL (don't know what #, it is not printed on front)

question # 15
it is a passage question but I don't think the passage is needed to answer it.

this is the figure in question .. it describes the force of collision of a puck with a wall as a function of time

the question is : What is the magnitude of change in the momentum of the puck?

and the explanation is

My question is ... I can't figure out where they got the 3 seconds from ?

please please help...

thanks a lot

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[Zona Pellucida]

The time in milliseconds (10^-3) is 4-1 = 3.

Impulse relies on how long the object is in contact with the wall (in this case).

On the graph you can see that it starts at one second, and ends at four. 4-1 = 3.