michelle is peadling down a steep hill on her bicycle and wants to be ablet to coast up the next hill which is 25.0 meters high, without pedaling up the hill at all. assuming her bicycle is 100% efficient her speed would be at least​

The volumes of a sample of lead and a sample of platinum are the same: 2 cm3. the density of lead is 11.3 g/cm3 and the density of platinum is 21.5 g/cm3. which is an accurate description of their relative masses? a. the masses of the lead and platinum samples are the same. b. the mass of the lead sample is greater than the mass of the platinum sample. c. the mass of the platinum sample is greater than the mass of the lead sample.