At the calculated moment, you start off from down the street, driving directly toward the cable, accelerating to 88 miles per hour.
11 seconds sound clip from the Back to the Future movie soundboard.
You can hear this line at 01:09:19 in the Blu-ray version of the movie.
Quote context
[...]
- Now... Let me show you my plan for sending you home.
- Please excuse the crudity of this model. I didn't have time to build it to scale or paint it.
- It's good. Oh, thank you. Thank you.
- Just as the connecting hook makes contact thereby sending 1.21 gigawatts into the flux capacitor...
- And sending you back to 1985.
- You wind up the car and release it.
[...]