Um atleta correu 400 metros em 80 segundos . qual é sua velocidade média ?

the answer to this is Use a seguinte fórmula:

AS = Variação de Espaço

AS = 400m

AT = Variação de Tempo

AT = 80s

Vm = 400/80

Vm = 5 m/s

A velocidade média do atleta é 5 m/s.

Se desejar a velocidade em km/h, multiplique por 3,6:

Vm = 18 km/h

Bons estudos amigo!

400 dividido por 80 =5  

OU

400 dirvidido por 120  =333

Entao é 50 KM

OU  33KM

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.

spare some change and give it to the poor

explanation:

plz : ((