star wars - How did Rose catch up to Finn?

At the end of movie:

Finn decides to drive into the battering cannon to destroy it. He is driving only forward and somehow Rose was able to hit him. How is that possible? She turned away for a moment so she has a longer way to go.

I assume:

• Finn and Rose has the same v[m/s] which is constant


• Rose has bigger s[m]


• pattern for time for v=const -> t=s/v

Verdict: She can't hit him. Or maybe she was faster?

Am I missing something?

Answer

His vehicle was slowed by the (pressure of the) cannon's beam. You see his ship buckling under the pressure and slowing.

Based on a quick eyeball assessment of his speed, from the point seen below it should have only taken him about five seconds to reach the cannon, yet he's still more than a hundred yards away eight seconds later when Rose hits him.

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It's also worth noting a couple of other facts;

• 
  

  His speeder already looked trashed when he sets off. In the brief time we see hers, it seems in better condition.

  
  


• 
  

  Literally the first thing Finn did was slam his ship into the ground at a hundred mph. That can't be good for it.

  
  



• 
  

  She's a Resistance Engineer by trade. Getting top performance out of ailing equipment is her entire raison d'être.