# Friction force physics problem

1. Oct 13, 2004

### Alem2000

a stockroom worker pushes a box with mass 11.2kg on a horizontal surface with a constant speed of 3.50m\s^2 The coeficient of friction is (for surface of the ground and box) .20 A...what horizontal force must the worker apply to maintian the motion.. i got $$F_x=21.9N$$ which is correct and then it asks me "it the force calculated in part a) is removed, how far does the box slide before coming to rest?" Where do i start..all I have is velocity?

2. Oct 13, 2004

### TenaliRaman

Once the applied force is removed,
what is the net force?
isn't net force = ma?
does that mean we have deceleration?
oh do we know initial velocity?
and what abt final velocity?
can i get the time?
hmm but s = ut + 1/2at^2 ?
so?
ah yes!

-- AI