John was pulled by a ski boat that weighs 600kg. John’s friend Chris wants to know how much force will need to be exerted for John to travel 20m/s. What force does the boat need to exert?
What Law of motion is demonstrated?

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.