Watch this clip before u get into a car to drive and watch it twice before u think about speeding! It might save lives! RE-TWEET! pic.twitter.com/Dc2l3hL2rH

Shocking dash-cam footage emerged Thursday showing a child running into a Brooklyn street and getting slammed by a car — just blocks from where a woman was fatally hit by a cement truck this week.

The boy tried to sprint across 55th Street between 14th Avenue and New Utrecht Avenue in Borough Park — just as a car approached Wednesday around 8 a.m., according to the video posted on Twitter.

The child was sent flying into the air on impact, as the vehicle screeched to a halt.

He landed a couple of feet ahead of the car, with the contents of his backpack strewn across the cement, and then shot right back up and walked away, video shows.

Police didn’t have a report of the incident.

Ezra Friedlander told The Post he was sent the footage on a WhatsApp group and decided to share it as a warning to motorists.

“Even if you’re driving within the law, be smart about it and drive extra slowly, because God forbid a kid runs out,” said the Borough Park resident.

Though the kid wasn’t looking before he crossed the street as he should have, Friedlander, 51, said, “In a community with so many children the onus is on us to be careful.”

“You’re on a congested block, with lots of children around, so be careful.”

The public relations consultant added: “Borough park is over congested [and] people get frustrated because they want to make the light.”

“That extra few seconds is not worth a life and this video illustrates that.”

The startling incident happened blocks from where 68-year-old Judith Wieder was killed Tuesday when a cement truck crashed into her as she crossed the street.

Additional reporting by Craig McCarthy