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**1. The problem statement, all variables and given/known data**

r(t)=(5.00t

^{2}x + 12.5t

^{3}y meters

The position r of a 12.0 kg mass, moving in the x-y plane

**2. Relevant equations**

Third derivative....

sqrt(x

^{2}+y

^{2})

**3. The attempt at a solution**

Is it correct to just take the third derivative and plug in 12 kg and find the magnitude and that would be a jerk?