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- 3. Solve the work done by a 500 W electric mixer in 2.5 minutes.v = λf = (1.30 m)(261.6 1/s) = 340.08 m/sThe electrical power, P (in watts), transformed by an electrical appliance is given by P = f(i) = 9i2 , where i is the electrical current flowing through the appliance, in amps. Find f(10) and f'(10), and interpret them in the context of this problem.