How many atoms at in a pencil

Describe uniform velocity and variable velocity in short

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?

Notice how they put future which of the clouds shown would indicate a possible future rain storm? a) b) c) d)