Re: earn some $
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kinematics / vectors, semi challenging.
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I think these are the easiest topics in physics.
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they're not really difficult so to speak.. but tedious.
ex) An archer shoots an arrow with a velocity of 47.5 m/s at an angle of 46.5° with the horizontal. An assistant standing on the level ground 150 m downrange from the launch point throws an apple straight up with the minimum initial speed necessary to meet the path of the arrow.
(a) What is the initial speed of the apple?
m/s
(b) At what time after the arrow launch should the apple be thrown so that the arrow hits the apple?
s
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