For b)
We will use the formula of Newton's second law
[tex]F=ma[/tex]
where F is the force, m is the mass and a is the acceleration. In this case we have
F=85N
m=75 kg
a=?
We will isolate the a
[tex]a=\frac{F}{m}[/tex]
we substitute the values
[tex]a=\frac{85}{75}=1.13m/s^2[/tex]
c)
We will use the same formula that we use previously but in this case, we have the next data
F=-85N
m=55 kg
[tex]a=\frac{-85}{55}=-1.55m/s^2[/tex]
ANSWER
b) 1.13 m/s^2
c)-1.55 m/s^2
