A van drives east across Colorado on 1-70. It took the van 8 hours to cross the state, which is 770 km wide. What was the van's average velocity?
a. 96.25 km/hr East
b. 770 mi/hr West
c. 6160 km/hr West
d. .01 mihr East

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) ! : )