Abicyclist 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

Kinetic energy of the horse and rider = 1/2 (mass) (speed)²

At 4.0 m/s :  KE = 1/2 (55kg) (4 m/s)²  =  440 joules

At 6.0 m/s :  KE = 1/2 (55kg) (6 m/s)²  =  990 joules

She increased the kinetic energy of herself and her vehicle by 550 joules,
so she must have put at least that much work into it.

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He sandals were out in the sun so the got hotter. which is why her feet felt hot.