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How many marks do you think I could get if I correctly said that the mass from tower A would fall onto the north pole (as the north pole is on the axis of rotation) but did not realise that mass B has an initial horizontal velocity and thought it would just fall straight down to the earth...

A fair paper. There seemed to be a greater-than-usual amount of 4/5 markers in Section I B. Not sure about the other options but i felt astrophysics was significantly easier than most years.