Question: How can i solve this ode system

diff(y1(t), `$`(t, 2)) = -y1/sqrt(y1^2+y2^2)^3, y1(0) = 1, y1(0) = 0

How can i solve this problem ,when i try to execute the error occur.since the y1(t) and y1 cannot both occur in the system.

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