- #1
Stochastic13
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Homework Statement
Two cars start moving form the same place. One goes north at a rate of 50 mi/hr, while the other heads east at a rate of 30 mi/hr. At what rate is the distance between the two cars changing exactly two hours later?
Homework Equations
The Attempt at a Solution
I thought that the equation for the velocity vectors is:
r(x) = 30xi + 50yj
and thus distance d two hours later is given by:
d = √(30x² + 50x² )
and
dd/dt = ∂x/dt + ∂y/dt
and after solving the equation I just plug in 2 for x and y to get what time the distance changes at the two hour mark.
Is this right?