A ball is thrown from an initial height of

=h+1−25t5t2

h=1+25t-5t^2

6=1+25t-5t^2

5=25t-5t^2

1=5t-t^2

t^2-5t+1=0

D=25-4=21

sqrtD=sqrt21

t1=(5+sqrt21)/2

t2=(5-sqrt21)/2

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