Acceleration Problem again :)?

Question

A race car can be slowed with a constant acceleration of -11 m/s

A) If the car is going 55 m/s how many meters will it take to stop?

B) How many meters will it take to stop a car going twice as fast?


I don't understand how you can do this problem when they only give you one piece of information.

I'm not trying to get someone to do my homework for me, I just really don't know where to begin, I've never been good in applying math to science.

Answer 1

you use the suvat equation

v^2=u^2+2as

although you arnt given it you know the v because when a car is at rest its velocity is 0 so suvat becomes:

s=? - you want to find this
u=55
v=0
a=-11
t=? - you dont need

plugging values in you can get an answer then you should be able to work out part b