Work done by a cycle on the road

[Taufik]

Here's a question, " A bicyclist comes to a skidding stop in 10m. During this process, the force on the bicycle due to the road is 200N along the horizontal and is directed opposite to the motion. What is the work done by the cycle on the road?"
From the definition of work done, work is the force times the displacement of the point of contact. Here, since the bicycle is skidding we can say that the point of contact is moving. Therefore W= F.S = 200x10 = 2000J
But the answer given is zero which means that the point of contact is not moving. How is it so?

 

[berkeman]

Welcome to the PF.

That's not really a New Member Introduction -- it should be posted in the Homework Help forums (the schoolwork forum section of the PF). Please re-post in the Homework Help, Introductory Physics forum, and fill out the Template you are provided when starting a new thread there. You should get good help on resolving your question.