Finding the initial velocity of an object

[adorrea]

Homework Statement

An object takes 12.3 meters to stop because of friction. Assume no skidding. If the coefficient of static friction is 0.86, what is the initial velocity of the object?

Homework Equations

initial velocity= mu*m*t

The Attempt at a Solution

 

[tiny-tim]

welcome to pf!

hi adorrea! welcome to pf!

(have a mu: µ )

use the work energy theorem …

work done = change in (mechanical) energy ​