Taking the derivative of displacement

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The discussion focuses on the derivation of the equation v = v0 + at from the displacement equation y = y0 + v0t + 1/2 at^2. It clarifies that taking the derivative of y with respect to time (dy/dt) leads to the velocity equation. The constant term y0 does not change with time, resulting in its derivative being zero. The participants explore the differentiation process, emphasizing the role of constants and initial velocity in the equations. Understanding these relationships is crucial for solving kinematic problems in physics.
cs23
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Homework Statement



how does y= y0 + v0t + 1/2 at2

become v = v0 + at ?

know v= dy/dt

Homework Equations




The Attempt at a Solution



dy/dt = dyo/dt + v0 + at

v= vo + vo +at
v= 2vo + at
 
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cs23 said:

Homework Statement



how does y= y0 + v0t + 1/2 at2

become v = v0 + at ?

know v= dy/dt

Homework Equations




The Attempt at a Solution



dy/dt = dyo/dt + v0 + at

y0 here is a constant and does not depend on time. So d/dt(y0) = 0.
 
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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