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
sveta [45]
3 years ago
10

Which describes a train’s acceleration if it changes speed from 25 m/s to 10 m/s in 240 s? positive acceleration no acceleration

negative acceleration
Physics
1 answer:
OLEGan [10]3 years ago
3 0

To understand acceleration, you need to know speed and velocity.

Why?

Acceleration is the change in velocity, and the velocity equation is:

velocity = distance / time     Units: (m/s)

If a change in position means an object has a velocity, then that means that a change in velocity has an acceleration (I recommend you look at the graphs, it will help a lot to understand the relationship between each).

Now that we have some background, lets use it to answer the problem!

The change in velocity is from 25 m/s to 10 m/s, and we have a time. Lets plug it into the (average) acceleration equation so we can visualize it better!

The symbol delta means "change" : Δ

a = Δv / Δt

expanded to:

a = vf - vi / tf - ti  

(vf = velocity final, vi = velocity initial, tf = time final, ti = time initial)

So if the train's speed went from 25 m/s to 10 m/s, then that means that 10 m/s is our final velocity and 25 m/s is the initial:

a = 10 - 25 / 240

a = -15 / 240

a = -0.0625 m/s^2

Since we ended up with a negative number, it means that the train has a negative acceleration!!!!!

The fast way to do this:

25 m/s is bigger than 10 m/s, so that means that to go from 25 m/s to 10 m/s you have to slow down--otherwise known as putting on your brakes. So if the change in speed is negative then the acceleration will be negative.

In other words, if your final speed is less than your initial speed then your acceleration would be negative.

Sorry for the long explanation! I hope you never struggle with this again though!

Hope it helped,

You might be interested in
Question 15)
RUDIKE [14]

Answer:

k Nishant

Explanation:

i think option A

8 0
2 years ago
The number of employees for a certain company has been decreasing each year by 4%. If the company currently has 650 employees an
nika2105 [10]
The answer would probably be 649.96
8 0
3 years ago
Energy ___________.
AVprozaik [17]

Answer:

BRAINLIEST PLSSSSSSSSSSSSSSSSSSSSSSSS

Thermodynamics

Explanation:

Thermodynamics is the study of energy. First Law of Thermodynamics: Energy can be changed from one form to another, but it cannot be created or destroyed. The total amount of energy and matter in the Universe remains constant, merely changing from one form to another.

7 0
2 years ago
Read 2 more answers
How does the phrase studying grammar function in sentence 4? A) main verb B) direct object C) subject complement D) subject of t
lisabon 2012 [21]

Answer: (b) direct object

Explanation:

6 0
3 years ago
Read 2 more answers
1. You discover that your iPod batteries keep dying after a few days. You think that the new 48 hour iBattery will work better.
stiks02 [169]

Answer:

Explanation:

It probably would

7 0
3 years ago
Other questions:
  • A maglev train can “float” because magnets in the bottom of the train and on the guideway...
    13·1 answer
  • In the early 19th century Christian Doppler, an Austrian physicist, proposed a theory regarding the properties of a moving sourc
    8·1 answer
  • What is atmospheric pressure and what are the diffetent units?
    15·1 answer
  • A MEMS-based accelerometer has a mass of m = 2 grams, an equivalent spring constant of k = 5 N/m, and an equivalent damping coef
    12·1 answer
  • Explain the relationship between force, mass and acceleration in Newton's second law
    13·1 answer
  • Using the lensmaker's formula (equation (5) of your lab manual), calculate the index of refraction of the acrylic lens. You shou
    8·1 answer
  • Which of the following involves reflected light waves
    6·1 answer
  • Astronaut Mark Kelly and his crew traveled to the International Space Station in the space shuttle. The shuttle burned off all r
    13·2 answers
  • Unpolarized light with an intensity of 432 W/m^2 passes through three polarizing filters in a row, each of which is rotated 30 d
    7·1 answer
  • A pendulum bob executing simple harmonic motion has 2cm and 12Hz as amplitude and frequency respectively. Calculate the period o
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!