How can I solve for v(t) when given F=Fo and v(t=0)=0?

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To solve for v(t) given F = Fo and v(t=0) = 0, start by using the equation v² = v₀² + (2/m)∫(x₀ to x) F(x) dx. Substitute F = Fo into the equation, which simplifies the integral. The challenge lies in deriving a time-dependent expression for v(t), as the initial attempts did not yield a variable t. It is suggested to establish a relationship between v, x, and x₀, and to utilize the fact that v = dx/dt. Proper formatting in LaTeX is also advised for clarity in equations.
mch
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Homework Statement

Homework Equations

The Attempt at a Solution



See LaTeX[/B]

given that $$v^2 = v_o^2 + \frac{2}{m}\int\limits_{x_o}^x F(x) \ dx\ $$ find the speed v(t) and the position x(t) given that $$F = F_o$$ and $$v(t=0)=0$$. I tried plugging in $$F=F_o$$ for $$F(x)$$ in the above equation but solving this equation for v never yields any variable t. So my question is, how can I solve for v(t)?

There we go. Sorry if the spacing is a little off. I'm not good at LaTeX
 
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mch said:
I tried plugging in $$F=F_o$$ for $$F(x)$$ in the above equation but solving this equation for v never yields any variable t. So my question is, how can I solve for v(t)?

First get a relation between ##v##, ##x##, and ##x_0##. Then note that ##v = \frac{dx}{dt}##.
 
mch the reason your equations are all spaced out is because you used the 'display math' delimiters which are double $ signs.

If you want to get in-line latex, which is what you need for some of your post, you can use double # instead.
 
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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