Final answer:
The formula that can be used to calculate the horizontal displacement of a horizontally launched projectile is Ax = v(cos θ).
Step-by-step explanation:
The formula that can be used to calculate the horizontal displacement of a horizontally launched projectile is Ax = v(cos θ). This formula is derived by resolving or breaking the motion into horizontal and vertical components. The horizontal displacement (Ax) is equal to the horizontal velocity (v) multiplied by the cosine of the launch angle (θ).