# Physics

posted by .

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'm confused a little, for these two problems they both want distance? or just time for a?

• Physics -

ok like one of the teachers previously stated to find the time.

V = Vi + at
0 = 55 - 11t
55 = 11t
5 = t

But for this problem i think you have to find two distance.

A, to find the distance
B, to find the distance i guess if the time is doubled, right?

• Physics -

A. stopping distance = (stopping time) x (average speed)
= (V/a)*(V/2) = V^2/(2a)

B. If the speed doubles, with deceleration rate "a" staying the same, the stopping distance is four times farther.

• Physics -

56 mph7 34mph

## Respond to this Question

 First Name School Subject Your Answer

## Similar Questions

1. ### 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?
2. ### 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?
3. ### 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?
4. ### 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?
5. ### 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 …
6. ### 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, …
7. ### 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?
8. ### 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 …
9. ### 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?
10. ### 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 …

More Similar Questions