- #1

## Homework Statement

The speed of a 4.0-N hockey puck, sliding across a level ice surface, decreases at the rate of 0.61 m/s2. The coefficient of kinetic friction between the puck and ice is:

A) 0.062

B) 0.25

C) 0.41

D) 0.62

E) 1.2

## Homework Equations

I'm not too sure but i know that :

If the body begins to slide along the surface, the magnitude of the

frictional force rapidly decreases to a value fk given by

fk =ukFN

where uk is the coefficient of kinetic friction

## The Attempt at a Solution

fk =ukFN

0.61=uk4

uk=0.61/4

uk=0.1525

But i was wrong