I don't think so. I've been allowed to make my own assumptions, one of which is that the car would experience no 'jolt' as it enters the loop, as the loop would be both perfectly round and perfectly flush to the floor at its beginning.
I'm sure that is the right avenue as that's the equation I used in part a
f = mv^2/r is the same as your equation mg = m(v^2/r), as f is measured in Newtons, making it the same as mg.
I just don't think it can be applied to part b as I don't know the entry velocity or the value of f (or mg)...
1. So the loop is known to be 12m in diameter (6m radius). Assume the car weighs 1250kg - how fast must the car go to clear the loop, and what will be its max G-forces endured?
This was the question, which I have broken into 3 sections:
a) Velocity at top of loop (done)
b) Velocity at start of...