Solve the Problem $\alpha$ Radians to the Horizontal and an Initial Speed of

Multiple Choice

Solve the problem. Assume the x-axis is horizontal, the positive y-axis is vertical (opposite g) , the ground is horizontal, and only the gravitational force acts on the objects
-A projectile is launched from the origin at an angle of $\alpha$ radians to the horizontal and an initial speed of Find the position function r(t) for this projectile.

A) r(t) = ( 75t cos $\alpha$ - 32 ) i + ( 75t sin $\alpha$ ) j
B) r(t) = ( 75t sin $\alpha$ ) i + ( 75t cos $\alpha$ - 16 ) j
C) r(t) = ( 75t cos $\alpha$ ) i + ( 75t sin $\alpha$ - 16 ) j
D) r(t) = ( 75t sin $\alpha$ - 16 ) i + ( 75t cos $\alpha$ ) j