A bicyclist increases her speed from 4.0 m/s to 6.0 m/s. The combined mass of the bicyclist and the bicycle is 55 kg. How much work did the bicyclist do in increasing her speed?

A. 11 J

B. 28 J

C. 55 J

D. 550 J

As the temperature of the water gets colder, the speed of its molecules:

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