Which explains the operation of a hydraulic lift system?

What is the momentum of a 2 kg object moving at 15 meters per second

In a system, when potential energy decreases, then entropy also decreases. true false

Cathy is pedaling down a steep hill on her bicycle and wants to be able to coast up the next hill, which is 25 meters high, without pedaling. cathy and her bicycle have a mass of 75 kg. assuming her bicycle is 100% efficient, what would her speed have to be?