Nothing about physics is basic to me. But yes, they should be able to calculate his speed with a very reasonable amount of certainty.
Whatever it was, it was too damn fast to be riding past entrances to the road he was on. I don't believe for a minute you get launched 100ft from your bike doing 35mph. Not when there is likely contact with the bike and/or car in the process, slowing you down further.
My motorcycle is my daily commuter. And I not only expect everyone else to do the stupidest thing possible, I am constantly calculating my escape scenarios for when they do. If you don't do this when you ride, start. And if you don't know how, please google and find resources to explain it.
Always sad to hear someone got in an accident - both sides could have taken steps to prevent it.