Answer:
Impulse: [tex]720 N\cdot s[/tex]
Explanation:
The impulse experienced by an object is given by:
[tex]I=F\Delta t[/tex]
Where
F is the magnitude of the force exerted on the object
[tex]\Delta t[/tex] is the time interval during which the force is applied
I is the impulse
For the halfback in this problem, we have:
F = 800 N is the force experienced
[tex]\Delta t = 0.9 s[/tex] is the time interval
Therefore, the impulse experienced is
[tex]I=(800)(0.9)=720 N\cdot s[/tex]
And this impulse is also equal to the change in momentum of the halfback.
