The horizontal velocity in miles per minute will be 14.49 miles per minute.
What is a vector?
The quantity which has magnitude, and direction, and follows the law of vector addition is called a vector.
A missile is fired at an angle of 75 from the horizontal. At one point, its speed was 900 mph.
Then the horizontal velocity in miles per minute will be
V = 900 x sin 75°
V = 869.33 mph
Then we have
V = 869.33 / 60 miles per minutes
V = 14.488
V ≅ 14.49 miles per minutes
More about the vector link is given below.
https://brainly.com/question/13188123
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