How Do You Measure a Bullet's Speed?

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To measure a bullet's speed, the basic formula involves calculating the velocity using the distance traveled over time. However, this simplistic approach does not account for factors like air resistance, bullet mass, and the forces acting on the bullet during its flight. The discussion highlights that without considering these variables, the formula for measuring bullet speed is incomplete. Accurate measurements require a more complex understanding of ballistics and physics. Ultimately, a comprehensive formula must incorporate these additional factors for precise calculations.
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what is the formula to measure how fast a bullet can go?
 
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That's all there is? No information as to the air resistance, mass of the bullet, force acting on the bullet? Then their is no such formula!
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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