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## Homework Statement

A box is given an initial velocity of 5m/s up a smooth 20 incline surface . The distance the box travel before coming to rest is?

## Homework Equations

I can't solve it correctly , I can't get the idea of this question

## The Attempt at a Solution

x= ?

vi=5

v=0

a=?

F = ma

mg cos ? = a

tan-1 20 = 87.14

180 = 90 + 87.14 + ?

?= 180 -90-87.14

?=2.9

(mg cos 2.9 = ma ) /m

g cos 2.9 = a

a= 28.03

x = 25 /( 28.03 )2

x= 0.45 m

My answer is so wrong !

But i can't figure out how to solve this problem