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Feb3-13, 07:49 PM
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PhanthomJay's Avatar
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You are not interpreting the problem correctly. The angle alpha is fixed as determined by the monkey's height and distance from the initial start point of the dart. It is the initial speed of the dart that may be varied, from an arbitrarily high value of unimaginable speed, to a relatively low value sufficient to reach the monkey before it hits the ground. Within this range of speed, with the dart fired at the angle alpha, the dart will always hit the monkey (ignoring air resistance of course). The lower curves have a lower horizontal velocity.