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* 无论身在何方,灵魂深处的那一个人是一生的牵挂*

Today what I had learned during revision

Monday, August 1, 2011
Newton's First Law of motion states that an object is at rest or move with constant velocity unless it is acted upon by net force.

Newton's Second Law of motion states that the rate of change of momentum is directly proportional to the force in the same direction.

Newton's Third Law of motion states that if object A exerts a force on object B, B exerts an equal and opposite force on object A

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