A soccer ball is kicked straight upwards with an initial vertical speed of 8.0 ms8.0\,\dfrac{\text m}{\text s} 8.0 s m 8, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction . We can ignore air resistance. How long does it take the ball to have a downwards speed of 4.0 ms4.0\,\dfrac{\text m}{\text s} 4.0 s m 4, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction ?

measuring things 1 litre of water

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me