![Sketch on Twitter: "@lunacyfer you're right - orders@fastspring.com. As for the bad service. FastSpring is the company that handles the purchase process for us" / Twitter Sketch on Twitter: "@lunacyfer you're right - orders@fastspring.com. As for the bad service. FastSpring is the company that handles the purchase process for us" / Twitter](https://pbs.twimg.com/media/C-6C-bcXYAIHVxT.jpg)
Sketch on Twitter: "@lunacyfer you're right - orders@fastspring.com. As for the bad service. FastSpring is the company that handles the purchase process for us" / Twitter
![FastSpring Logo Business Computer Software Product, payment method, text, logo, payment png | PNGWing FastSpring Logo Business Computer Software Product, payment method, text, logo, payment png | PNGWing](https://w7.pngwing.com/pngs/71/732/png-transparent-fastspring-logo-business-computer-software-product-payment-method-text-logo-payment.png)
FastSpring Logo Business Computer Software Product, payment method, text, logo, payment png | PNGWing
![Sketch on Twitter: "@exibit Hi, you'll need to contact FastSpring at orders@ fastspring.com with this issue. Thanks" / Twitter Sketch on Twitter: "@exibit Hi, you'll need to contact FastSpring at orders@ fastspring.com with this issue. Thanks" / Twitter](https://pbs.twimg.com/media/FgBEqswUoAAWNXV.jpg)
Sketch on Twitter: "@exibit Hi, you'll need to contact FastSpring at orders@ fastspring.com with this issue. Thanks" / Twitter
![SOLVED: Student creates a pulse on a slow (heavy) spring at the same time that student B creates a pulse on a fast (light) spring: The incomplete figure below shows the pulse SOLVED: Student creates a pulse on a slow (heavy) spring at the same time that student B creates a pulse on a fast (light) spring: The incomplete figure below shows the pulse](https://cdn.numerade.com/ask_images/c88db0f6d9524b8490b60a28c243e982.jpg)
SOLVED: Student creates a pulse on a slow (heavy) spring at the same time that student B creates a pulse on a fast (light) spring: The incomplete figure below shows the pulse
![Sketch al Twitter: "@jpercab you can contact @FastSpring, our partners with the payment method, in order to resolve your issue" / Twitter Sketch al Twitter: "@jpercab you can contact @FastSpring, our partners with the payment method, in order to resolve your issue" / Twitter](https://pbs.twimg.com/media/DA6tITdXkAI0PG6.jpg)