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关注：1
2013-05-23 12:21
求翻译：In the air the ball still has inertia. It’s going to keep moving in the same direction at the same speed until a force makes it do otherwise. Well, the force of gravity pulls it toward the ground in a curved path, like Galileo’s cannonball. Also, the force of friction with air particles slows down the ball. Friction wi是什么意思？ 待解决
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In the air the ball still has inertia. It’s going to keep moving in the same direction at the same speed until a force makes it do otherwise. Well, the force of gravity pulls it toward the ground in a curved path, like Galileo’s cannonball. Also, the force of friction with air particles slows down the ball. Friction wi
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