Answer:
[tex]62.4N\cdot s[/tex]
Explanation:
The change in momentum of the ball is equal to the impulse exerted on it, therefore:
[tex]\Delta p = I = F \Delta t[/tex]
where
[tex]\Delta p[/tex] is the change in momentum
F is the average force exerted on the ball
[tex]\Delta t[/tex] is the time during which the force is applied
In this problem,
F = 156 N
[tex]\Delta t = 0.40 s[/tex]
So, the change in momentum of the ball is
[tex]\Delta p =(156)(0.40)=62.4N\cdot s[/tex]
