A train brakes from 40 m/s to a stop over a
distance of 100m, what
is the acceleration of
the train?

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery

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?

Convection currents are caused by differences in what two things?