The centrifugal force exerted on rotating turbine blades varies directly as the square of velocity. If the centrifugal force of 1.21x10^6 Nis acting on the blades that move at 550 m/sec , find the instantaneous rate of change of the centrifugal force as the velocity increases to 820m/sec. Round the answer to the nearest whole number.

I need to see how to set up the problem.please