# Calculating final Velocity

by KatieLynn
Tags: final, velocity
 P: 67 1. The problem statement, all variables and given/known data Find the final velocity of the object if it is initially moving along the x axis with average velocity of -62 m/s. Other information mass=.462kg time=5s average force = 0.8N impulse=4 2. Relevant equations F=m(Vf-Vi)/t 3. The attempt at a solution I use the equation like this (0.8N)=(.426kg)(Vf+62m/s)/(5s) =-61.13m/s Is that right?
 P: 23 I dont know why they gave you impulse, you can solve the problem with this equation: Vf = Vi + at where Vf=final velocity, Vi=initial velocity, a=acc. and t=time. Remember - the acc. is .8/.462 because F=ma, so a=F/m. Good luck!
 P: 67 Vf = Vi + at Vf= (-62m.s) + (.8/.462)(5) = -53.3 m/s Thats what I got but it isn't right. I'm sure I didn't up the algebra, did I plug something in wrong?
P: 23

## Calculating final Velocity

well then i guess your initial approach is correct. the equation I gave might not work cuz i didnt read the part that said "avg velocity". I think your -61 is correct

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