Coefficient of friction question, help please

[physicsgoon]

Homework Statement

1. A childs slide is straight and inclined at 25^o to the horizontal. Matthew of mass 35kg goes down the slide at a constant speed.

(a) draw a diagram
(b) find the magintude of normal reaction force between matt and slide.
(c) Find the coefficient of friction between matt and the slide

part (a) and (b) are fine i got 311N for part (b) but couldn't find (c)

Homework Equations

F = MA
F = ,U (mew) x R

The Attempt at a Solution

Resolved it in direction of friction got;

Fr - 35gsin25 = 35a
could not do this as had two unknowns
same with
F = mew x 311 and F = 35a

any help would be greatly appreciated!

 

[PhanthomJay]

Matthew of mass 35kg goes down the slide at a constant speed.

What does that imply about the value of the acceleration?

 

[physicsgoon]

it implies that the acceleration is zero, i see now, thanks very much for your help :)