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## Homework Statement

What is the force of friction on the elastic powered car as it rolls accross a smooth surface?

GIVENS

Displacement= 16.25m, Change in time= 22.5s, G=9.8m/s, Mass= 1kg

UNKNOWNS

V1=?, A=? Ff=?

## Homework Equations

F=MA, A=V/T, Change displacement=((V1+V2)/2)T)

## The Attempt at a Solution

First, I used the givens using the change in displacement equation to find V1 which I got 1.4m/s , then i subbed it into A=(V2-V1)/t, I got -31.5m/s ( im not sure why i got a negative? maybe deceleration?) and then i subbed it into F=MA to get -31.5 as my force applied...not sure why this is negative either and not sure where to go from here...