Explain how to identify a starting position on a line.

We can easily find out the beginning point of the line by using dot representation.

When it comes to position vector, it expresses the exact position of certain object from the starting point of  the coordinate system.  

The vector is a straight line that has a certain end  which is fixed to its body.  

The other end is linked with a moving point that tells an accurate position of that specific point.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

answer: option c.

explanation: