An elevator in an office building completed the following trips:
• Ist floor to 8th floor
• 8th floor to 4th floor
• 4th floor to 13th floor
The distance between each floor of the office building is 3.0 m. which table shows the total distance traveled and displacement of the elevator ?

Displacement is downward, x<0

Velocity is also downward ,v<0

But acceleration is in direction of velocity ,a>0

I hope it will help you

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.  

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray