Physics help!!!

This was a problem on my quiz, but for some reason, I didnt think that there was enough info to solve it.  HELP ME 4CHAN!!!



A car activates its breaks when its at a velocity of 30m/s.  Coeff of friction btw car and ground is 0.2.  find out how much time does it take the car to come to a complete stop.

this was the EXACT question, with no extra info provided.

your teacher is probably fucking with you. there is not enough info.

Yea, that's what I thought.  thanks.

You'd need... the car's mass, I think?

and the car break's force

>>5
i think youre assuming its skidding or something?

could be that you are supposed to make a suggestion for the amount of mass. I have had fucked up teachers like that.

>>6
well if it isn't, i guess with the mass and break's force, you could assume the wheel is weighless and use torque or something..

>>7
or you could just give an answer with a variable in it for the mass