# An object travels North at #15 m/s# for #2 s# and then travels South at #2 m/s# for #8 s#. What are the object's average speed and velocity?

##### 1 Answer

speed = 4.6 m/s

velocity = 1.4 m/s (north) or -1,4m/s (south)

#### Explanation:

To start of, we have to find the the total distance (or disposition covered) north and south which can be derived from the speed (or velocity) formula and total time taken

therefore,

When the object is traveling north:

When the object is traveling south

Now we have to distinguish between speed and velocity, since they are similar but they are not the same thing.

Speed is

however,

Velocity is

Distance is not the same as disposition, as distance is a scalar quantity while disposition is a vector quantity.

Scalar quantities do not have direction, so the calculations are done without calculation,

thus

But, vector quantities are affected by direction, so we have to check the directions in calculations,

thus,

when calculated to south, the velocity will be