Kinetic friction problem

[GUC_Stud]

1. The problem statement, all variables and given/known data

a box is dropped onto a covoyer belt moving at 2 m\sec .if the coefficient of friction between the box &the belt is 0.4 ,how long before the box moves without slipping ?


2. Relevant equations
F(friction)=N(normal reaction) X coefficient of friction


3. The attempt at a solution

i have no ideas about solving the problem , :(
thnx for help

[berkeman]

Assume the box is slipping as it hits the belt, and doesn't bounce. Like, it's dropped from a very low height, almost touching the belt. So that simplifies the problem to where you just start out with the belt pushing the box's mass to the side via kinetic friction. What does the box do due to this sideways force? Write an equation for the motion of the box in this first part of its motion.