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
Ede4ka [16]
3 years ago
10

a police officer finds 60 m of skid marks at the scene of a car crash. Assuming a uniform deceleration of 7.5 m/s to a stop , wh

at was the velocity of the car when it started skidding?
Physics
1 answer:
Oliga [24]3 years ago
6 0
The equation to be used is for the rectilinear motion at constant acceleration:

x = v₀t + 0.5at²
a = (v-v₀)/t
where
x is distance
v and v₀ is the final and initial velocity
t is time
a is acceleration

Because the acceleration is decelerating, that would be reported as -7.5 m/s². Substituting,

-7.5 = (0 - v₀)/t
v₀ = 7.5 t --> eqn 1

x = v₀t + 0.5at²
60 = (7.5t)(t) + 0.5(-7.5)(t²)
Solving for t,
t = 4s

Thus,
v₀ = 7.5 m/s² * 4s
v₀ = 30 m/s
You might be interested in
Assuming 70% of Earth's surface is covered in water at an average depth of 2.5 mi, estimate the mass of the water on Earth in Ki
saw5 [17]
This is an excellent question that i do not have the answer to.
7 0
3 years ago
Examples of uniform velocity​
slava [35]

Explanation:

When a truck travels in equal distances in equal intervals of time then we say that the body has got a uniform velocity. In the above example a truck is traveling at 5 miles in all the positions at A, B, and C and all in the intervals of 5 minutes each.

8 0
3 years ago
El dormitorio de Pablo es rectangular, y sus lados miden 3 y 4 metros. Ha decidido dividirlo en dos partes triangulares con una
Paraphin [41]

Answer:

 c = 5 m

Explanation:

this exercise you want to divide the rectangular room into two triangular rooms

                 

the area of ​​triangles is

           A = ½ base height

           A = ½ 4 3

          A = 6 m²

the length of the curtain can be found using the Pythagorean theorem

           c² = b² + a²

           c = √ (4² + 3²)

           c = 5 m

this is the length of the curtain

5 0
3 years ago
Define anterior and posterior in correlation to the body. (ANATOMY)
tatyana61 [14]

Answer:

it should be right it's from go.ogle hm!!!

Explanation:

Anterior or ventral - front (example, the kneecap is located on the anterior side of the leg). Posterior or dorsal - back (example, the shoulder blades are located on the posterior side of the body). Medial - toward the midline of the body (example, the middle toe is located at the medial side of the foot).

8 0
3 years ago
Read 2 more answers
~~~~~NEED HELP ASAP~~~~~
Romashka-Z-Leto [24]

Answer:

Centripetal Acceleration 18.75 m/s^2, Rotational Kinetic Energy 843.75 J

Explanation:

a Linear acceleration (we cant find tangential acceleration with the givens so we will find centripetal)

a= ω^2*r

ω= 300rev/min

convert into rev/s

300/60= 5rev/s

a= 18.75m/s^2

b) use Krot= 1/2 Iω^2

plug in gives

1/2(30*2.25)(25)= 843.75 J

8 0
3 years ago
Other questions:
  • What are the SI base units for length and mass?
    14·2 answers
  • If two objects are in thermal equilibrium, do they have the same thermal or internal energy?
    12·1 answer
  • Select the correct answer.<br> Which word describes a goal that is poorly written?
    13·1 answer
  • Technician A says that a heater core leak can be the result of the coolant wearing a hole through the core. Technician B says th
    11·1 answer
  • If density of an object is 3gcm-3, will it float or sink in water.
    5·1 answer
  • 6th grade science I mark as brainliest
    12·1 answer
  • How can a systematic error affect the reported data?
    13·2 answers
  • A person is lifted 24 meters by the elevator in a building. If the
    9·1 answer
  • A person with a gravitational force of 750 N is sitting in the centre of a hammock which is strung between two trees. The ropes
    11·1 answer
  • Between the orbits of Mars and Jupiter, several thousand small objects called asteroids move in nearly circular orbits around th
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!