Answer:
-5.1 kg m/s
Step-by-step explanation:
Impulse is the change in momentum.
Change in momentum= final momentum - initial momentum=m
+m

Plugging in the values= -0.15*24 - (0.15*10) (The motion towards the pitcher is negative as the initial motion is considered to be positive)
Impulse=-5.1 kg m/s (-ve means that it is the impulse towards the pitcher)