A Level Physics: An experiment to determine gravitational acceleration

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Two methods of finding the gravitational acceleration, g.
Past Paper Question used to illustrate:
OCR Physics A Depth in Physics June 2018 (Note, these are my solutions, only, rather an official mark scheme).
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for the first part of the question, can i say: attach the steel ball to an electromagent and connect the electromagent to a DC supply. ensure the electromagnet is turned on initially then turn off the DC supply to allow the ball to fall to the base of the rhetord stand. measure the time using 2 light gates connected to a data logger

kausarlolz