Finding mass of a sliding block

[KatieLynn]

Homework Statement

Assume g= 10 m/s^2
A plane 25m in length is inclined at an angle of 36.9 degrees. A block of weight 250N is placed at the top of the plane and allowed to slide down. The coefficient of friction is 0.5. The velocity is negative and the block weighs 250N. The mass of the block is most nearly what?

Homework Equations

i don't know...

The Attempt at a Solution

so 250N/sin(36.9)=416.37kg (?) is that anywhere near what I should be doing?

 

[Kurdt]

Weight is given by W= mg. I'm not sure why this question has all the extra information unless there are several parts or you haven't typed it in full.