Velocity needs to have which of the following?

speed

direction

both speed and direction

neither speed nor direction

Both speed and direction

Explanation:

Most people use both terms (velocity and speed) as if they were the same thing. But the reality is that this concepts are different , specially in physics.

Speed is a scalar quantity that refers to how fast an object is moving. It can be calculated as distance divided by time.

Velocity is a vector, and is the rate at which an object changes position in a certain direction. Because the direction is important here, velocity uses  displacement instead of distance:

in a direction

(Speed is based on a distance, and velocity is based on displacement, and the major difference is that velocity deals with direction, and speed has no direction).

The conclusion we can take from all of this is that the velocity can be defined as the speed with direction. So the velocity needs both speed and direction. Otherwise, the speed is a scalar quantity and it can only be defined with its value.

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

explanation: