Correct answer only ! a car travels at a constant velocity of 70 mph for one hour. at the second hour, the car’s velocity was 60 mph. at the third hour, the car’s velocity was 80 mph. at what hour was their positive acceleration? at what hour was their negative acceleration? show your work!

The key to stability is feedback between the reservoir and the fluxes into and/or out of the reservoir. assume that the rate of outflow from a reservoir depends on the size of the reservoir according to the following relationship: outflow rate= k x (size of reservoir), where k is a constant. a reservoir of water has a volume of 5000 liters, and the rate of outflow at steady state is 25 liters per minute. what is k? (give both the numerical value and its units.) what is the residence time? what is the relationship between k and the residence time?

Complete the sentence to describe the law of conservation of energy. the law of conservation of energy states that energy cannot be created or , but it can be

Acompound machine is also called a machine. a. force b. simple c. complex d. directional