WEBVTT

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- Khi một cầu thủ bóng chày ném

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một quả bóng bay nhanh,
quả bóng chắc chắn có động năng.

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Chúng ta biết vậy vì
nếu chặn quả bóng,

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quả bóng sẽ đập vào bạn,
khá đau đấy.

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Bạn phải cẩn thận.

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Nhưng tôi muốn hỏi là:
việc các cú ném,

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trừ phi ném bằng khớp ngón tay,

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việc các cú ném hướng về dĩa nhà

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đều làm quả bóng chày xoay
có cho thấy là quả bóng

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đang có động năng thêm không?

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Câu trả lời là có, và chúng ta
sẽ tìm hiểu,

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đó sẽ là mục tiêu của video này.

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