In 2009, Usain Bolt of Jamaica set a world record of 9.58 s in the 100 m dash. What was his average speed? Give your answer in kilometers per hour.

Below

Explanation:

To find the average speed of a person you can use this formula :

     Velocity = distance / time

Plugging in our values ...

     Velocity = 100 m / 9.58 s

                    = 10. 4384... m/s

To convert m/s to km/h, multiply the speed by 3.6

     10.4384133612 x 3.6 = 37.578288100317 km/h

                                        = 37.6 km/h

*if your teacher says to round to 1 sig fig because of the 100m then round it to 40 km/h*

Hope this helps! Best of luck <3

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day