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- The speed limits on a straight road are given by a known function g(x,t) where x is the location on the road and t is time. A car starts at x = 0 at time t= 0 and always drives at the speed limit. The location of the car is given by the (unknown) function s(t). Is there a differential equation that defines s(t)?
The speed limits on a straight road are given by a known function g(x,t) where x is the location on the road and t is time. A car starts at x = 0 at time t= 0 and always drives at the speed limit. The location of the car is given by the (unknown) function s(t). Is there a differential equation that defines s(t)? Assume g(x,t) is differentiable function (unlike the way real speed limit laws are).
(The motivation for the problem is wondering about how to model a "disturbance" propagating through a medium where the properties of the medium determine the velocity at which the disturbance propagates - but the version using a car and speed limits sounds more concrete.)
If ##s(t)## is 1-to-1 then we have ##s'(t) = g( s^{-1}(t),t)##. That could be called a differential equation, but is there a more usual type of differential equation for it?
(The motivation for the problem is wondering about how to model a "disturbance" propagating through a medium where the properties of the medium determine the velocity at which the disturbance propagates - but the version using a car and speed limits sounds more concrete.)
If ##s(t)## is 1-to-1 then we have ##s'(t) = g( s^{-1}(t),t)##. That could be called a differential equation, but is there a more usual type of differential equation for it?