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Hi, I'm teaching myself Yr-11 level physics at the moment 'cause I'm planning to sit the GAMSAT next year... and I'm really stuck on how to work out the direction of the magnetic field in solenoids... as in which is the N and which is the S poles. Can someone give me some help? Thanks all -helen

In relation to the second question, I don't understand why Blackjack had: " F = - 0.5 * m / 350 * ( v_i² - 0.25*v_i² = - 0.5 * 1600 / 350 * 0.75 * v_i²." if velocity slowed to half the initial velocity, wouldn't it be: F =...