# physics

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 5.5 m/s2 for 4.9 seconds. It then continues at a constant speed for 6.7 seconds, before applying the brakes such that the car’s speed decreases uniformly coming to rest 292.81 meters from where it started. The yellow car accelerates uniformly for the entire distance, finally catching the blue car just as the blue car comes to a stop.
1) How fast is the blue car going 8 seconds after it starts?
2) How far does the blue car travel before its brakes are applied to slow down?
3) What is the acceleration of the blue car once the brakes are applied?
4) What is the total time the blue car is moving?
5) What is the acceleration of the yellow car?

1. 👍 0
2. 👎 0
3. 👁 271
1. This would make an excellent graphic solution...I am certain you have done distance, velocity graphs.

If you want to nerd it out in math,
work it in steps.
1. figure speed at 4.9 seconds, then that is te speed at 8 seconds..
2. how far? figure the distance while accelerating, then the distance at constant speed. add them
3. use Vf^2=Vi^2+2ad solve for d, vi is the speed at brake application.

just work it in steps.

1. 👍 0
2. 👎 0
2. you mom

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Physics

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 m/s2 for 3.6 seconds. It then continues at a constant speed for 11.7

asked by Kurt on September 6, 2019
2. ### Physics

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 4.8 m/s2 for 4.5 seconds. It then continues at a constant speed for 9.9

asked by Jeel on January 22, 2011
3. ### Physics

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 3.5 m/s2 for 3.6 seconds. It then continues at a constant speed for 10.1

asked by Hayls on January 24, 2011
4. ### Physics

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 5 m/s2 for 4.2 seconds. It then continues at a constant speed for 11.1

asked by Isaiah on January 21, 2015
5. ### phys

A motorist is driving at 20m/s{\rm m/s} when she sees that a traffic light 200m{\rm m} ahead has just turned red. She knows that this light stays red for 15s{\rm s} , and she wants to reach the light just as it turns green again.

asked by Av on September 16, 2014
6. ### physics

Let's say you're driving in your car, approaching a red light on the Camp Hill Bypass. A black Porsche is stopped at the light in the right lane, but there's no-one in the left lane, so you pull into the left lane. You're

asked by Jake on December 18, 2015
7. ### physics

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 4.6 m/s2 for 4.4 seconds. It then continues at a constant speed for 8.5

asked by a on September 13, 2011
8. ### physics

please somebdy help me solveing this. 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 4.3 m/s2 for 3.3 seconds. It then

asked by atif on September 20, 2014
9. ### physics

Consider a horizontal road with such a set of traffic lights, each spaced 100 m apart. A car sits at the first traffic light. At t=0 the light turns green and the car accelerates. What is the maximum time t in secondsthe

asked by stranger on May 27, 2013
10. ### physics

A cyclist is at rest at a traffic light. When the light turns green, he begins accelerating at 2.13 m/s2. How many seconds after the light turns green does he reach a cruising speed of 5.05 m/s?

asked by Kevin on August 22, 2015

More Similar Questions