Physics
posted by Priscilla .
A race car can be slowed with a constant acceleration of 11 m/s^2
a. If the car is going 55 m/s, how many meters will it travel before it stops?
b. How many meters will it take to stop a car going twice as fast?
I know you use the equation d = Vit +1/2 at^2 but to find the distance would you just calculate d = vit only.
v = Vo + a t
so
v = 55  11 t
when is v = 0 ?
0 = 55  11 t
so t = 5 seconds to stop
d = Vo t + (1/2) a t^2
d = 55 (5)  (1/2) 11 (25)
= 275  137.5
=137.5 meters
Vo = 110 m/s

Physics 
Priscilla
Ok i think i understand. I'm pretty sure you have to use the full equation d= vit +1/2 at^2

Physics 
drwls
a) The average velocity when decelerating will be Vo/2 = 27.5 m/s. Multiply that by the time required to stop, Vo/a, to get the stopping distance X.
X = (Vo/a) * (Vo/2)
X = Vo^2/(2 a)= (55)^2/(22) = 137.5 m
Same answer you got, but I used a shortcut 
Physics 
Priscilla
HAPPY NEW YEAR! Ok, thanks a lot.
Respond to this Question
Similar Questions

physics
A race car can be slowed with a constant acceleration of 14 m/s2. (a) If the car is going 44 m/s, how many meters will it travel before it stops? 
Physics
A race car can be slowed with a constant acceleration of 11 m/s^2 a. If the car is going 55 m/s, how many meters will it travel before it stops? 
Physics
A race car can be slowed with a constant acceleration of 11 m/s^2 a. If the car is going 55 m/s, how many meters will it travel before it stops? 
Physics
A race car can be slowed with a constant acceleration of 11 m/s^2 a. If the car is going 55 m/s, how many meters will it travel before it stops? 
physics
a stunt car driver testing the use of air bags drives a car at a constant speed of 25m/s for a total of 100 meters. he applies his brakes and accelerates uniformlu to a stop just as he reaches the wall 50 meters away. SKETCH THE A … 
physics with 6 questions
Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 3.3 m/s2 for 3.9 seconds. It then continues at a constant speed for 13.7 seconds, … 
physics
a race car can be slowed with a constant acceleration of 11m/s2. a.if the car is going 55m/s,how many meters will it travel beofre it stops? 
physics
You are driving a car 35mi/h down the road. The stoplight in front of you suddenly turns red and you slam on the brakes, skidding to a halt. You get out of the car and measure the skid marks made by your tires to be 28.5m meters. (Assume … 
Physics
A car accelerates from rest at 2.3m/s^2 for 18 seconds, then decelerates to 15 m/s over 301 meters. A) How fast is the car moving at 18seconds? 
Physics
A car is going 18.3 m/s down a road. At time t=0s, a squirrel runs in front of the car 36 meters away. It takes the driver t=0.67s to slam on the brakes, but after that , the brakes offer a frictional force F(fr)=21000N. Her car masses …