v=s'(t)
s'(t)= 4*1/2*8*1/√(8t-4)= 16/√(8t-4)
s'(1)= 16/√(8-4)= 16/√4= 16/2= 8
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v=s'(t)
s'(t)= 4*1/2*8*1/√(8t-4)= 16/√(8t-4)
s'(1)= 16/√(8-4)= 16/√4= 16/2= 8