please help

Show Attempt History Current Attempt in Progress * Your answer is incorrect. In which one or more of the following situations is the principle of conservation of mechanical energy obeyed? An object moves uphill with an increasing speed. An object moves uphill with a decreasing speed. An object moves uphill with a constant speed. An object moves downhill with an increasing speed An object moves downhill with a decreasing speed. An object moves downhill with a constant speed. eTextbook and Media