A car makes a 75 mile trip in 1 hour. For the first 30 minutes, it travels at 50 miles per hour. For the second 30 minutes, it travels at 100 miles per hour. What is the instantaneous velocity of the car at minute 45? c A- 25 mph B- 50 mph C-75 mph D- 100 mph

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) ! : )