Answer
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Work Step by Step
The author told us to explain the concept of impulse without using any math.
The impulse is the effect of force exerted on some object for some time. It measures the effect of the net force like changing the object's velocity or acceleration or stopping the object.
Let's take an example, if you through the ball directly toward the wall by some speed $v$, you can see that the ball will back toward you after hitting the wall by the same speed $v$ (if the collision was perfectly elastic) or at some speed of $v_1$ less than $v$. During the time the ball touches the wall, the wall exerts an impulse on the ball.
And as we can see, the impulse changed the direction of the ball's velocity in a very short time.
Also, you exert an impulse on the baseball when you hit it with the baseball rocket since during the time of collision you change the ball's direction and speed.
