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Tpy6a [65]
3 years ago
7

You push a heavy crate. at first it doesn't move. you push harder, and it finally starts to move, but you still have to exert so

me force to keep it moving at a constant velocity.explain
Biology
1 answer:
Galina-37 [17]3 years ago
3 0
Newton's first law of motion states that when there is no net external force, an object will remain at rest or travel with a constant velocity. 
When an object is moving, there is a force of friction resisting the motion, and slowing it down. To maintain a constant velocity, a person must push with a force equal to that of friction, to counteract the frictional force. 
Since the pushing force cancels the friction force out, there is no net external force, and so the object moves at a constant velocity

Hope I helped! xx
P.S.: Think this question is more suited to be asked under the "Physics" section
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If an animal fossil was found in a rock, what would be the best way to determine its absolute age?
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Answer:

D

Explanation:

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To identify the absolute age of a fossil,  the amount of certain radioactive elements in the rock are measured. When fossils are formed in the rocks, a small amounts of radioactive elements is included in it. The process to identify age of fossil using radioactive elements is known radiometric dating. So, radioactive isotope and its decay product gives absolute age of fossils.

Hence, the correct answer is "D".

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Hope this helped :)
7 0
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mixas84 [53]
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ratelena [41]

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Reika [66]

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