Answer:
-10.88 kg m/s
Explanation:
The change in momentum of the ball is given by:
[tex]\Delta p= m\Delta v=m(v-u)[/tex]
where
m is the mass of the ball
u is the initial velocity of the ball
v is the final velocity of the ball
Let's take the initial direction of the ball as positive direction. In this reference frame, we have:
m = 0.145 kg
u = +35 m/s
v = -40 m/s
Therefore, the change in momentum is
[tex]\Delta p=(0.145 kg)((-40 m/s)-(+35 m/s))=-10.88 kg m/s[/tex]
And the sign is negative since the change in momentum is in the opposite direction to the initial direction of the ball.
