1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Lesechka [4]
3 years ago
8

A car is traveling at 20.0 m/s, and the driver sees a traffic light. turn red. After 0.530 s (the reaction time), the driver app

lies the brakes,. and the car decelerates at 7.00 m/s2. What is the stopping distance of the. car, as measured from the point where the driver first sees the red light?
Mathematics
1 answer:
slava [35]3 years ago
5 0
Before the driver applies the brakes ( with the reaction time ):
d 1 = v0 · t = 20 m/s · 0.53 s = 10.6 m
After that: 
v = v0 - a · t1  
0 = 20 m/s - 7 · t1
7 · t1 = 20
t1 = 2.86 s
d 2 = v 0 · t1 - a · t1² / 2
d 2 = 20 m/s · 2.86 s - 7 m/s² · (2.86 s)²/2 = 57.2 m - 28.6 m = 28.6 m
d = d 1 + d 2 = 10.6 m + 28.6 m = 39.2 m
Answer: the stopping distance of a car is 39.2 m.
You might be interested in
The rational number<br>number ———————<br>is equal to its negative​
Zarrin [17]
Zero is equal to its negative
3 0
3 years ago
The hourly wages for employees at a hardware store are shown. ​
NemiM [27]

Answer:

do you have a picture

Step-by-step explanation:

instructions uncleat

8 0
3 years ago
May someone please help with the way please
Oksana_A [137]

Answer:

17.6 m²

Step-by-step explanation:

Given the ratio of similar shapes = a : b, then

area of shapes = a ² : b²

Δ PTQ and Δ PRS are similar and so the ratio of corresponding sides are equal, that is

PT : PR = 6 : 9 = 2 : 3, thus

ratio of areas = 2² : 3² = 4 : 9

let the area of Δ PQT be x, then using proportion

\frac{4}{x} = \frac{9}{x+22} ( cross- multiply )

9x = 4(x + 22) ← distribute

9x = 4x + 88 ( subtract 4x from both sides )

5x = 88 ( divide both sides by 5 )

x = 17.6

Thus area of Δ PQT = 17.6 m²

5 0
3 years ago
I need help what is (6x9)+(7+3)=
Inessa05 [86]

Answer:

64

Step-by-step explanation:

Evaluate the parenthesis before doing the addition, that is

(6 × 9) + (7 + 3)

= 54 + 10

= 64

3 0
3 years ago
A log splitter can split 6/5 cords of wood in 4/5 of an hour. Complete the unit rate by setting up a complex fraction and simpli
Digiron [165]

Answer:

1½ cords per hour

Step-by-step explanation:

A log splitter can split 6/5 cords of wood in 4/5 of an hour.

To find a unit rate, we divide the quantity of cords of wood by the time.

This gives us the complex fraction.

\frac{ \frac{6}{5} }{ \frac{4}{5} }

This is the same as

\frac{6}{5}  \div  \frac{4}{5}

To divide two fractions, we multiply by the reciprocal of the second fraction.

\frac{6}{5}   \times   \frac{5}{4}

\frac{3}{1}   \times   \frac{1}{2}

This simplifies to:

\frac{3}{2}  = 1 \frac{1}{2}

The unit rate is 1.5 cords per hour

3 0
3 years ago
Other questions:
  • Simplify the expression sin 2x+ sin x + cos2x - 1.
    7·1 answer
  • Suppose a triangle has two sides of length 32 and 35, and that the angle between these two sides is 120°. What is the length of
    7·1 answer
  • How do I solve this????<br><br> Simply the following 3 2/7 + 2 3/14 + 4 3/7.
    15·1 answer
  • Using distributive property what is (x+y)/3
    5·2 answers
  • what is 372x19+89 WANT FREE POINTS? COME HERE SHHHH! I HAVE TO ASK A QUESTION SO IT DOESNT GET DELETED! LET ME KNOW IF YOU WANT
    6·2 answers
  • Find the quotient simplify your answers a+3 over a divided by 8 over a
    5·1 answer
  • You have piano lessons every fifth day and cooking classes every sixth day. Today you have both lessons. In how many days will y
    14·1 answer
  • Evaluate the variable expression when -= 6, b= 5, and c= -3
    15·1 answer
  • The graph shows the distance, in miles, that Anders traveled over a period of nine hours. Use the graph to determine the constan
    14·1 answer
  • How I can answer this question, NO LINKS, If you answer correctly I will give u brainliest!
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!