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## Homework Statement

I am having trouble getting the answer for this one. The question is about two students moving a piano. The piano weighs 260kg and one student is pushing with 280N Forward and the other 340N Forward. The piano is accelerating at 0.30m/s^2 Forward.

They are asking for kinetic friction as well as how long it will take for the piano to stop moving after pushing it for 6.2 seconds from rest

## Homework Equations

## The Attempt at a Solution

So far I have tried adding the two students Newtons and then diving the weight of the piano (times gravity) which gives me 2548. Then I divide by the ammount of Newtons the students are applying on the piano (Forward) which is 620N (combined) by 2548

The answer I get is around 0.24 for the coefficient of kinetic friction. The back of the book says 0.21. Could someone please tell me what I am doing wrong, and possibly how I could go about finding the second part of the question. Thanks.