URGENT A student throws a ball horizontally out of a window which is 8m above the ground. Another student was 10 m away caught it. What was the horizontal velocity of the ball

J. j. thomson’s experiment disproved the theory that an atom

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During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?