"A projectile is launched at the edge of a cliff 50 meters high, so that its initial vertical velocity is 45 m/s upward, and its initial horizontal speed is 20 m/s. Where and when will it land at the bottom of the cliff?"
You need to set the starting vertical ("y vel") velocity to -45 m/s (cell B7) and the starting horizontal velocity ("x vel") to 20 m/s (cell E7).