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
lara [203]
3 years ago
8

4. How fast was a driver going if the car left skid marks that were 32 feet long on dry concrete? (The coefficient of friction i

s 1.02)?
73 mph


49 mph


Oo oo


38 mph


31 mph
Mathematics
1 answer:
Monica [59]3 years ago
8 0

Answer:

v_{o} \approx 31.247\,mph

Step-by-step explanation:

The deceleration experimented by the car is the product of kinetic coefficient of friction and gravitational constant:

a = \mu_{k}\cdot g

a = (1.02)\cdot \left(32.174\,\frac{ft}{s^{2}} \right)

a = 32.817\,\frac{ft}{s^{2}}

The initial speed is computed from the following kinematic expression:

v^{2} = v_{o}^{2} - 2\cdot a \cdot \Delta s

v_{o} = \sqrt{v^{2}+2\cdot a\cdot \Delta s}

v_{o} = \sqrt{\left(0\,\frac{ft}{s} \right)^{2}+2\cdot \left(32.817\,\frac{ft}{s^{2}} \right)\cdot (32\,ft)}

v_{o}\approx 45.829\,\frac{ft}{s}

v_{o} \approx 31.247\,mph

You might be interested in
Pls helpppppppppppppo
vovikov84 [41]

Answer:

b I do believe

Step-by-step explanation:

can you help me

8 0
3 years ago
The circumference of a circle is 12pi feet. What is the diameter?
zaharov [31]

Answer:The diameter is 12cm

Step-by-step explanation:

4 0
3 years ago
Solve for the variable in each equation.
vaieri [72.5K]
All of the answers are 0
5 0
3 years ago
For the data shown in the scatter plot below, identify a point apart from the main cluster
poizon [28]

The answer is (8, 7)

6 0
3 years ago
Does anyone know the answer? Please help.
user100 [1]

Answer:

(0,-2)

Step-by-step explanation:

the answer is (0,-2) because -2 is where the line crosses over the y-axis. If we looked at a graph you would see that the line goes over 0 on the X-axis, which causes the line to touch the y-axis and intercept it at the -2 mark.

An easy way to find the answer for these sorts of questions is to draw out a graph and mark the coordinates on it and draw the line conecting them. Once you've done that you can easily see where the line intercepts on both the y and x axis.

8 0
2 years ago
Read 2 more answers
Other questions:
  • Quincy found 120 shells during four days at the beach. if quincy found the same number of shells each day, how many shells did h
    6·2 answers
  • CDEF is a kite and FCE equals 16. Find 2
    6·1 answer
  • Wht is -3(2x-1)+8=15
    7·1 answer
  • What is the percentage of 1669 out of 25
    14·2 answers
  • Find the value of x. If necessary, round your answer to the nearest tenth. O is the center of the circle. The figure is not draw
    6·1 answer
  • Charlie has 12 feet of rope. He cuts it into pieces that are each of a foot long. How many pieces of rope will he have?
    10·1 answer
  • What is the answer?​
    6·1 answer
  • 10. Which points are on the line that passes through (-4,-3), (20, 15), and (48, 36) ?<br>​
    7·1 answer
  • Write the square of (2x+1/x)
    10·1 answer
  • In ΔTUV, the measure of ∠V=90°, the measure of ∠U=85°, and VT = 20 feet. Find the length of TU to the nearest tenth of a foot.
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!