Solve the problem. Unless stated otherwise, assume that the projectile flight is ideal, that the launch angle is measured from the horizontal, and that the projectile is launched from the origin over a horizontal surfaceAn ideal projectile is launched from the origin at an angle of ? radians to the horizontal and an initial speed of 
Find the position function r(t) for this projectile.
A. r(t) = (100t sin ?)i + (100t cos ? - 16t2)j
B. r(t) = (100t cos ?)i + (100t sin ? - 16t2)j
C. r(t) = (100t sin ? - 16t2)i + (100t cos ?)j
D. r(t) = (100t cos ? - 32t2)i + (100t sin ?)j
Answer: B
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