Most countries besides the USA use the metric system also known as S.I (system internationale) as a system of measurement...
Answer:
Yes, the velocity of the object can reverse direction when its acceleration is constant. For example consider that the velocity of any object at any time t is given as: ... At At t = 0 sec, the magnitude of velocity is 2m/s and is moving in the forward direction i.e.v (t) = -2.
<span>A good conductor have lots of free electrons present in it As due to very less difference between valence band and conductive band so electrons can be easily available for conducting electricity
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Answer:
Velocity
Explanation:
In physics, there are two types of quantity:
- Scalar quantity: these quantities have a magnitude only, so they don't have a direction. Examples of scalar quantities are mass, temperature, time...
- Vector quantity: these quantities have both a magnitude and a direction. Example of vector quantities are velocity, acceleration, force...
An example of vector quantity is velocity. Velocity is defined as

where
is the displacement of an object, which is a vector connecting its initial position to its final position of motion
is the time elapsed
Therefore, velocity has a magnitude and a direction (which is the same as the direction of the displacement). This quantity is used in daily life in many situations, for example when we drive in a car, it is useful to know the velocity at which the car is going.