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Wouldn't be full marks lol

Yeah I agree it should have been 50Hz. Lots of people put 50kHz that I've asked but.

Nah lol don't write both. I only know from hearing peoples answers. You also didn't need to keep it in a quadratic, could've just took the roots of both sides.

Think there's two possible answers. One is greater than the kidney impedance and one is less than. Both should be correct.

For induction cooktops in multiple choice. Was the frequency 50kHz or 50Hz because isn't power supply for AC limited to 50Hz?

You have to consider the original velocity as well. So you work out initial GPE and initial KE, giving you total energy of the system. (1) Then you work out final GPE at 500km altitude. (2) Conservation of energy means that (2)+final KE is equal to (1) Therefore you get value of final KE (at...