### What is the change in momentum of the ball

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Q. After a tornado, a 0.60 g straw was found embedded 3.0 cm into the trunk of a tree. If the average force exerted on the straw by the tree was 90 N, what was the speed of the straw when it hit the tree?

Q. A 0.144 kg baseball is pitched horizontally at 38.0 m/s. After it is hit by the bat, it moves at the same speed, but in the opposite direction.

(a) Draw arrows showing the ball's momentum before and after it hits the bat.

(b) What was the change in momentum of the ball?

(c) What was the impulse delivered by the bat?

(d) If the bat and ball were in contact for 0.80 ms, what was the average force the bat exerted on the ball?

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