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At time t2 : V(t2)=¨öVo -> r(t2)=¨öro : ro-¥át2=¨öro -> ro=2¥át2 .

Are you sure this is right?

the V is a function of r cubed...so V(t2)=0,5V0 implies that

r(t2)¡Á0,5r0

Calculus

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