12) 16 m/s (Law of Conservation of Momentums)
13) 12 lbs (don't worry that you do not understand physics, your teacher do not understand it as well, force is not measured in kg or lbs)
15) 15N and direction opposite to force applied initially
16) 19m
Answer:
Direct Current
Explanation:
The electricity only flows in one direction.
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Answer
given,
mass of base ball = 0.14 kg
speed before it made the contact with the ball (V i) = 42 m/s
speed after batter hit the ball(V f) = - 48 m/s
a)
impulse = change in momentum
=
=
= -12.6 Kg m/s
Magnitude of impulse = 12.6 Kg m/s
b)
Force = 
= 
Force = 2520 N