Coasting along at 7.10 m/s, a 60.0 kg bicyclist on a 7.60 kg bicycle encounters a small hill. If the speed of the bicyclist is 6.00 m/s at the top of the hill, how much work was done on the bicyclist and her bike?
The Attempt at a Solution
I tried finding the loss in KE and having that be the work done. I get
.5*67.6kg*36 - .5*67.6kg*50.41
I get -487 J and it tells me this is the wrong answer? What did I do wrong?