Question 350553
The centripetal force is 



Fcp = m*v^2/r 



and since F = m*a ---> a = F/m = mv^2/(r*m)-->



a = v^2/r (a = centripetal acceleration)



plug in your numbers:



2 m/sec^2 = v^2/8 m



v^2 = 16 m^2/sec^2



v = 4 m/sec