Write this code in MATLAB.

Write this code in MATLAB.

1. As of early 2018, Usain Bolt holds the world record in the men's 100-meter dash. It is 9.58 seconds. What was his average speed in km/h? Assign the result to a variable called hundred.

2. Kenyan Eliud Kipchoge set a new world record for men of 2:01:39 on September 16, 2018. Assign his average speed in km/h to the variable marathon. The marathon distance is 42.195 kilometers.

Expert Answer

[David Hill]

What have you done?

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

[vmnf kfnk]

whats wrong with code

distance1=100; time1=9.58; hundred=distance1*18/(time1*5); disp(hundred); distance2=42.195*1000; time2='2:01:39';

[Walter Roberson]

Assign his average speed in km/h to the variable marathon.

You did not do that.

You will be wanting to convert time2 into hours. If you have one of the most recent versions of MATLAB, that is easily done by combining duration() with hours()

[vmnf kfnk]

Can you answer this question to me, please solve my problem, I need answer code

[Rik]

This is your homework. These are fairly basic Matlab instructions: assign something to a variable with a specific name. If you don't know how to do this, go back to the explanation you got before this question. If it did not explain this you should do a basic Matlab tutorial.

Walter mentioned two functions you could use to convert '2:01:39' to decimal hours. Have you read the documentation of these functions? The Matlab documentation is very good, it is one of the key advantages over competitors like Python and GNU Octave. You should really try using it to understand what a function does.

[vmnf kfnk]

Finally, I solved this question

[vmnf kfnk]

Thanks for all

[Shashank Mahajan]

how plz help?vmnf kfnk

[Walter Roberson]

Speed is distance divided by time. The required output is km/h so first convert the distance to kilometer and the time to hours.

[Nadya Shahin]

how come the distance1*18/(time1*5)? what's the meaning of 18 and 5?

[Walter Roberson]

18/5 is 3.6 which is 3600 seconds divided by 1000 metres per kilometre

[Ashish Kumar]

%Converting distance in kilometers
distance1 = 100/1000; 

%Converting time in hours
time1 = 9.58/3600;    

%Calculating speed
hundred = distance1 / time1 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
distance2 = 42.195;
%Calculating and Converting time in hours
time2 = (121*60+39)/3600;
%Calculating speed
marathon = distance2 / time2

[Abdulrahman Farouq]

Thx so much

Answer 1

[vmnf kfnk]

y=0.1/9.58;
hundred=y*3600
x=42.195/((121*60)+39);
marathon=x*3600

[Priya Dwivedi]

https://learningtool.mathworks.com/launch ....is my solution wrng?

[Rik]

I guess because 100 meter is 0.1 kilometer, but this is the problem with undocumented code.

Edit: the original comment by Priya Dwivedi was "Y u took 0.1 in the above calculation?"

[Walter Roberson]

The link to learningtool does not go anywhere useful. I am not sure that we as outside people would be able to see a student solution anyhow.

Answer 2

[Gokul Krishnan]

y=0.1/9.58; 
hundred=y*3600
x=42.195/((121*60)+39);
marathon=x*3600

Answer 3

[Abhiram K Narayanan]

us_dist = 0.1
us_time = (9.58/3600)
hundred = us_dist/us_time
ken_dis = 42.195
ken_time = 2.0275
marathon = ken_dis/ken_time

Answer 4

[Haya Aldawsari]

%Usain
time1 = (9.58/60)/60
distance1 = 100/1000
hundred = distance1/time1
%Kenyan
time2 = 2 + (1/60) + (39/3600)
distance2 = 42.195
marathon = distance2 / time2

[Rik]

This isn't Cody. Why did you post this answer? What does it teach? Why should it not be deleted?

[Haya Aldawsari]

can you please explain what's wrong with my answer?

[Rik]

Let me answer with a question: What is the fundamental difference between this answer and the previous one? If people read one of the answers and then the other, will they have learned more?

[Haya Aldawsari]

I started learning Matlab one week ago by taking a course on Coursera and I had this question as an assignment, after solving this assignment, I posted my answer here which is really similar to other answers.

I see many similar answers here and still are not deleted, why?

I am new here and this is my first answer and I earned the First Answer badge from Matlab, I was happy when I received this encouraging email :)), and then you are telling me to delete my answer!

Do not kill the enjoyment, please!!!!

[Rik]

Posting duplicate solutions is perfectly common for Cody, but here the goal should (in my view) be to have different solutions.

I absolutely don't want to kill your enjoyment. Maybe you are the next Walter Roberson. I just want every answer to actually add something. Why encourage cheating? I'm just one person, so it is not feasible for me to spend all my time deleting duplicate answers. I do delete a lot of them, but answering new questions is much more fun.

I hope you will join 'us' in answering non-homework questions. It is a lot of fun and you can learn a lot. Some people have been programming Matlab since around the time I was born and reading their solutions is quite an education.

Given this discussion I don't think this answer should be deleted anymore, but not due to the answer itself. I hope you understand my intentions.

[Haya Aldawsari]

Thank you so much for your advice

Now I understand your point and you are right

I will definitely try my best to answer non-homework questions and learn from others' answers.