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
AnnZ [28]
2 years ago
15

A driver of a car traveling at 25 m/s applies the brake, causing a uniform acceleration of -3 m/s2. A) How long does it take the

car to accelerate to a final speed of 20 m/s? B) How far has the car moved during the braking period?
Physics
1 answer:
IrinaVladis [17]2 years ago
8 0
T= final velocity- initial velocity/ acceleration
T= 20m/s - 25 m/s / -3m/s^2
T= -5/ -3
T= 1.67 s
Therefore, it takes the car 1.67s to accelerate to a final speed of 20m/s.
You might be interested in
• ¿Qué rapidez tendrá un sonido de 150 Hz con una longitud de onda de 2 metros?
kobusy [5.1K]

Answer:

Speed = 300 m/s

Explanation:

Given the following data;

Frequency = 150 Hz

Wavelength = 2 meters

To find the speed of the wave;

Mathematically, the speed of a wave is given by the formula:

Speed = wavelength * frequency

Substituting into the formula, we have;

Speed = 2 * 150

Speed = 300 m/s

7 0
3 years ago
How are electromagnetic waves used in the military?
sweet [91]
It uses electromagnetic radiation waves to enable military communications, navigation, radar, nonintrusive inspection of aircraft, and other equipment. Hope this helps.
7 0
3 years ago
Why is it important to develop alternative energy sources
Aliun [14]

Answer:

The alternative energy sources are defined as those resources that are used in place of the natural and non-renewable resources. This resources plays an important role in the conservation of natural resources.

The fossil fuels are the resources on which the people are directly dependent. Burning up of these fossils leads to the emission of carbon, which has a direct impact on earth. A small increase in the amount of carbon dioxide can lead to the increase in the surface temperature of earth.

In addition to this, these fossil fuels such as coal, petroleum, oil and natural gases are found to be present in a limited proportion, and it is a very expensive process to obtain these resources, so sustainable development method must be adopted in order to save this natural resources for the future generation.

Some of the examples of alternative resources that are widely used in place of fossil fuels are wind energy, solar energy, tidal energy, biomass energy and bio-fuels.

Thus, it is very important to develop and use alternative resources.

7 0
3 years ago
77. There is a 250-m-high cliff at Half Dome in Yosemite National Park in California. Suppose a boulder breaks loose from the to
lisabon 2012 [21]

Answer:70 m/s or 6.84 s

Explanation:

8 0
3 years ago
A force of 1 newton will cause a mass of 1 kg to have an acceleration of 1 m/s^2. If a force of 5 newtons is applied to a mass o
nignag [31]

For any force and any mass, the acceleration is always

(the strength of the force) divided by (the mass) .

If a force of 5 newtons is applied to a mass of 5 kg, the acceleration will be

(5 Newtons) / (5 kg) = <em>1 m/s²</em>

7 0
3 years ago
Other questions:
  • Which is the best example of Newton's First Law of Motion? A small, lightweight ball and a large, heavy ball are dropped off the
    13·2 answers
  • Which of the following statements about iron filings placed upon glass resting on top of a bar magnet is false?
    8·2 answers
  • Objects fall at constant velocity
    12·2 answers
  • ★CHECK MY ANSWER PLEASE★
    7·2 answers
  • 1. How much force would you have to apply to a 15kg object in order to accelerate it!<br> a 2 m/s?
    8·1 answer
  • Consider a point on a bicycle wheel as the wheel turns about a fixed axis, neither speeding up nor slowing down. Compare the lin
    7·1 answer
  • A truck travels to and from a stone quarry that is located 2.5 km to the east. What is the total distance traveled by the truck?
    13·1 answer
  • A pendulum is made by attaching a sphere to the end of a string of negligible mass and it oscillates when released from an angle
    15·1 answer
  • Which is heavier, 1 m3 of steel or 1 m3 of aluminium?​
    10·1 answer
  • Calculate the volume of an object of mass 500g whose density is 70kgm-3 <br><br>​
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!