Newton's first law says that if a body is at rest it remain at rest but if a body is moving in uniform linear motion it keep moving on and on and on untill a external force is applied ,so when I slip my book in straight line it stops after 3 s how this is done which force is stopping my book to keep moving .

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Solution

Actually newtons has given 3 laws of motion the condition of stoping of books can be explained by Newton 3 rd law of motion that is for every action there is an equal and opposite reaction when you push your book this is action and the opposing reaction is frictional force which tends to oppose moving force and book stops this frictional force is the external force which mentioned in Newtown 1st law.

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