Question

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

Answer 1

Choice-D is the correct one.
For the solution, see my detailed response
to the other posting of the same question.