I have been drawing a straight line while solving the problem. I agree that I don't see how I can get enough information. There is nothing else mentioned - I copied it exactly.
Also, the answer that the book gives is 4 ms^-2 for the deceleration, and 56 ms^-1 for the velocity at E.
I've been attempting to solve this problem for three days now. I have thrown away my old attempts (like, scrumpled up into the bin), but my old attempts involved:
Trying to set up simultaeneous equations relating the journeys between EH and FG to find the deceleration, but the reason why this...