1.2-kg rubber ball of speed of 8.0 m/s hits a floor and bounds back at speed of 6.0 m/s. Suppose the rubber ball is in contact with the floor for 2.0 ms, what is the magnitude of the average force exerted by the floor on the rubber ball? a. 1.2 kN. b. 7.7 kN. c. 8.4 kN. d. 9.1 kN. e. 9.8 kN.

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