Projectile on an Incline (Downward Motion) Calculator

Calculate key parameters for a projectile launched downward on an incline (with the projectile moving downward relative to the plane).
The equations used are:
Time of Flight: \[ t = \frac{2\,v_0\,\sin\left(\phi-\theta\right)}{g\,\cos\phi} \]
Range along the Incline: \[ R = \frac{2\,v_0^2\,\cos\theta\,\sin\left(\phi-\theta\right)}{g\,\cos^2\phi} \]

* Enter the initial velocity (m/s), launch angle (°), incline angle (°), and gravitational acceleration (m/s²). Ensure that the launch angle is less than the incline angle.