Question

Homework help plz do not understand ​

Answer 1

Hello!

The answer are:

For the first exercise:

a).
`004(m)/(s^(2) )`

For the second exercise:

b).
`.0056(m)/(s^(2) )`

Why?

For boths question we will use the following formula:

`Vf=Vi+a*t\\a=(Vf-Vi)/(t)`

First, let's convert mph to mps:

For the first exercise:

`(60mile)/(h)*(1h)/(60min)*(1min)/(60seconds)=(60m)/(3600s)=(0.0166m)/(s)`

So,

`60mph=0.0166mps`

For the second exercise:

`(100mile)/(h)*(1h)/(60min)*(1min)/(60seconds)=(100m)/(3600s)=(0.0277m)/(s)`

So,

`100mph=0.0277mps`

So, for the first exercise:

`0.0166=0+a*4\\a=(0.0166-0)/(4)=0.004(m)/(s^(2) )`

Then, for the second exercise:

`0.0277=0+a*5\\a=(0.0277-0)/(5)=0.0056(m)/(s^(2) )`

Have a nice day!