The potential energy stored in the wound-up spring of a toy motor-car is 18 J. Ignoring any frictional resistance to motion, find the distance this car (mass 200 g) will travel an a slope of 1 in 5. (Plz ans with process; Ans given =45.9cm)​

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?