One event in a high school track meet is the 400 meter run. if the runners of the 400 meter event start and end at the same location, what is their displacement? a. 0 b. 200 c. 400 d. 800

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) ! : )