# A car experiences uniform acceleration

1. Apr 17, 2010

### Cris911

1. A car initially at rest experiences uniform acceleration of 5m/s2 for 6 seconds. It maintains constant velocity for 14 seconds and is then brought to rest in 5 seconds by a uniform retardation.
a. Find out how far the car has travelled.
b. Find the total angular displacement of one of the wheels

2. Apr 17, 2010

### thebigstar25

3. Apr 17, 2010

### Cris911

i cant because i dont know how to do it

4. Apr 17, 2010

### thebigstar25

I am not allowed to give solution .. but I will try to explain the question and what are you supposed to do ..

in brief,
1) the car experience a constant acceleration for 6s.
2) then it experience a constant velocity for 14s.
3) finally, it experience deceleration for 5s.

it is clearly that you are going to use the kinematic equations:
vf = vo + at , (where vf:final velocity .. vo: initial velocity .. a: acceleration .. t:time)
x = vot + 0.5 at*t (x is the distance)

there are other equations, but i believe you can solve your question using those equations (if you needed other equation, go ahead and use it)

you can use these equations in my statements in 1 and 3 to find the distance .. in statement 2 you have to consider something else to find the distance ..