A military cannon is placed at the base of a hill. The cannon is fired at an angle toward the hill. The path
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Answer:
The gradient of a line is given by .
Any 2 points of a vertical line would have the same x-coordinate. Thus when you simplify the denominator, you would end up with a zero. If you enter that into your calculator, no matter what you numerator is, you would get a Math error. This is because you cannot possibly divide a number by zero. Thus, the gradient is undefined.