Please help! Asap! Which of the following correctly describes the relationship between speed and velocity?

A. Speed is the change in velocity over time; velocity is distance plus direction.
B. Speed is the change in distance over time; velocity is speed plus direction.
C. Speed is distance plus direction; velocity is speed plus time.
D. Speed is the change in acceleration; velocity is distance over time.

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?

What must be the same for any two resistors that are connected in series ? a. the potntial diffrence across each b. the rate at which charge moves through each c. the rate at which energy is used by each d. the resistance to the flow of charge of each

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z