![4804341040](/avatars/38186.jpg)
4804341040
05.04.2020 •
Mathematics
A car braked with a constant deceleration of 64 ft/s2, producing skid marks measuring 50 ft before coming to a stop. How fast was the car traveling when the brakes were first applied?
Solved
Show answers
More tips
- F Food and Cooking Which Calamari Salad is the Most Delicious?...
- S Style and Beauty How are artificial nails removed?...
- S Style and Beauty Secrets of Tying a Pareo: 5 Ways...
- F Food and Cooking Everything You Need to Know About Pasta...
- C Computers and Internet How to Choose a Monitor?...
- H Horoscopes, Magic, Divination Where Did Tarot Cards Come From?...
- S Style and Beauty How to Make Your Lips Fuller? Ideas and Tips for Beautiful Lips...
- C Computers and Internet How to Learn to Type Fast?...
Answers on questions: Mathematics
- M Mathematics (-2)x(-2)x(-2)x(-2)x(-2)...
- M Mathematics Brian made a circular coaster from a square piece of wood as shown in the diagram below. The length of the square is 12cm. In terms of pi, what is the circumference, in centimeters,...
- M Mathematics According to the diagram, which are congruent? Check all that apply. AABC and ADEF AABC and ADFE ZBAC = ZDEF ZACB = ZDEF AB and DF AC and DF...
- M Mathematics The chess club has 28 members that are divided into 2 groups. The difference between the number of people in the first group is equal to 3 more than one half the average of...
- M Mathematics Machine A makes 60% of the bottles in a factory and machine B makes the others. Machine A breaks 3% of products it produces and Machine B breaks 4%. If a bottle is selected...
- M Mathematics 2. Perla buys a mountain bike for $250. The bike loses value at a rate of 15% per year. When will Perla s bike be worth only $20?...
- M Mathematics WHAT IS THE PERIMETER OF A SEMICIRCLE WITH THE RADIUS OF 20 CENTIMETERS?...
- M Mathematics What does 2 go into 3 how. Many time...
- M Mathematics Find the volume of the cylinder...
- M Mathematics Find the value of the expression y − z for y = 7 and z = 6....
Ответ:
The initial speed of the car was 80 ft/s.
Step-by-step explanation:
The deceleration is the rate at which the car speed decreases. In this case the speed of the car goes all the way down to 0 ft/s and in order to do that it travelled 50 ft. So we will call the initial speed at which the car started to brake "v_0" and use Torricelli's equation to find it. The equation is given by:
v^2 = (v_0)^2 + 2*a*S
Where v is the final speed, v_0 is the initial speed, a is the rate of acceleration and S is the space travelled. Using the values that the problem gave to us we have:
0^2 = (v_0)^2 - 2*64*50
0 = (v_0)^2 - 6400
(v_0)^2 = 6400
v_0 = sqrt(6400) = 80 ft/s
Notice that in this case "a" was negative, since the car was decelerating instead of accelerating.
The initial speed of the car was 80 ft/s.
Ответ:
The inicial speed of the car was 80 feet per hour.
Step-by-step explanation:
To solve this problem, we can use Torricelli formula to calculate the inicial speed of the car:
V2 = Vo2 + 2*a*D
where V is the final speed, Vo is the inicial speed, a is the acceleration and D is the total distance travelled.
Using V=0, a=-64 and D=50, we have:
0 = Vo2 + 2*(-64)*50
Vo2 = 2*64*50 = 6400
Vo = 80 ft/s
The inicial speed of the car was 80 feet per hour.
Ответ:
2/3 x 6 gallons = 4 gallons.
You would be able to put all the orange juice in 4 containers.