Answer:
[tex]3 m/s^2[/tex]
Explanation:
Newton's second law states that:
[tex]\sum F = ma[/tex]
where
[tex]\sum F[/tex] is the resultant of the forces acting on an object
m is the mass of the object
a is the acceleration
In this case we have two forces:
F = +70 N (east direction) is the horizontal push
Ff = -10 N (west direction) is the frictional force
so the net force is
[tex]\sum F=70 N - 10 N = 60 N[/tex]
We also know the mass of the crate
m = 20 kg
So we can find the acceleration
[tex]a=\frac{sum F}{m}=\frac{60 N}{20 kg}=3 m/s^2[/tex]
