An assistant for the football team carries a 30.0-kg cooler of water from the top row of the stadium, which is 20.0 m above the field level, down to the bench area on the field. (a) if the speed of the cooler is constant throughout the trip, calculate the work done by the assistant on the cooler of water. (b) how much work is done by the force of gravity on the cooler of water?

An object with initial temperature 130 ∘ f is submerged in large tank of water whose temperature is 50 ∘ f . find a formula for f ( t ) , the temperature of the object after t minutes, if the cooling constant is k = − 0.2 . remember newton's law of cooling (the rate of change of temperature with respect to time is equal to k times the difference between the temperature of the object and the surrounding temperature) ! : )