How quickly can a car travel 50m?

Driving in France.

I was involved in a minor car accident. No-one injured, not too much damage. The other driver's missus is onto the police in a flash rather than exchanging details.

He was stopped at some red lights with a scooter in front of him. There were two lanes which merged into one lane about 50m after the lights. I was in the 2nd lane slowing down as I approached the lights, but still doing 15-20mph. The lights changed to green. The scooter moved off but this guy didn't. So I thought I'd just glide past him and slip in front. Wouldn't have bothered if he'd moved off when the lights turned green as I wasn't in any rush and am a bit too old to be racing.

Anyway, he ends up hitting me just behind my drivers side back wheel with just infront of his driver side front wheel (LHD) I was just about completely infront of him when the accident occurred. He claims he was going 25mph and that I sped up to squeeze through the gap.

I'd probably have let this go as a 50:50 even though I believe he was mainly at fault. He didn't move off as the lights changed to green and then tried to speed up as I had already passed him. I didn't even bother to accelerate as I passed him as I thought there wasn't a problem. I do have a powerful car and could quite easily have floored it and passed him and the scooter if I wanted to. But I didn't.

Anyway, my question is how quickly can a bog standard 10yr old+ renault megane type 1.6 cover 50m from a standing start? How fast will it be going when it gets to 50m?

In my opinion, he was an idiot to speed up after I was almost past, especially with two young kids in the back.