A 1,300kg car moving at 20m/s and a 900kg car moving at 15m/s in precisely opposite directions participate in a head- on crash. If we consider this event to be a perfectly inelastic collision, what is the speed and direction of the cars after
the impact?

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) ! : )