How do I calculate the kynetic energy in deceleration

I have the an array of velocity and the Mass and I want to do a script which plot the energy only in deceleration.....Thank you.

Answer 1

[sixwwwwww]

Dear Marco, here is code for kinetic energy in deceleration:

mass = 20;
velocity = 10:-0.1:1;
KE = 0.5 * mass * velocity .^ 2;
plot(velocity, KE), 
title('Kinetic Energy vs Velocity'), 
xlabel('Velocity')
ylabel('Kinetic Energy')
set(gca,'xdir','rev')

Good luck!

[Marco]

but i have positive and negative array and i want to plot only the energy in deceleration

[Marco]

i want to calculate the energy in braking

[sixwwwwww]

In case of both negative and positive velocity values. You can start velocity vector from negative and increment in it a positive value. So code will be something like this:

mass = 20;
velocity = -10:0.1:1;
KE = 0.5 * mass * velocity .^ 2;
plot(velocity, KE), 
title('Kinetic Energy vs Velocity'), 
xlabel('Velocity')
ylabel('Kinetic Energy')
set(gca,'xdir','rev')

and if you don't need to plot velocity values on x-axis then you can modify above code lines as:

plot(KE), 
set(gca,'ydir','rev')

I hope it help you

[Marco]

the velocity is always positive, I want to plot the energy when the acceleration is negative V = [10 20 10 5 15 40 20]; :-)

[sixwwwwww]

Here you have velocity values. When you see velocity decreasing then you can plot the KE for that region. You can do it using for loop and the code i posted above