Hello!
The answer are:
For the first exercise:
a).[tex]004\frac{m}{s^{2} }[/tex]
For the second exercise:
b).[tex].0056\frac{m}{s^{2} }[/tex]
Why?
For boths question we will use the following formula:
[tex]Vf=Vi+a*t\\a=\frac{Vf-Vi}{t}[/tex]
First, let's convert mph to mps:
For the first exercise:
[tex]\frac{60mile}{h}*\frac{1h}{60min}*\frac{1min}{60seconds}=\frac{60m}{3600s}=\frac{0.0166m}{s}[/tex]
So,
[tex]60mph=0.0166mps[/tex]
For the second exercise:
[tex]\frac{100mile}{h}*\frac{1h}{60min}*\frac{1min}{60seconds}=\frac{100m}{3600s}=\frac{0.0277m}{s}[/tex]
So,
[tex]100mph=0.0277mps[/tex]
So, for the first exercise:
[tex]0.0166=0+a*4\\a=\frac{0.0166-0}{4}=0.004\frac{m}{s^{2} }[/tex]
Then, for the second exercise:
[tex]0.0277=0+a*5\\a=\frac{0.0277-0}{5}=0.0056\frac{m}{s^{2} }[/tex]
Have a nice day!
