A slingshot fires a pebble from the top of a building at a speed of 5.0 m/s. The building is 20.0 m tall. Ignoring air resistance,
1. Discover the speed with which the pebble strikes the ground when the pebble is fired horizontally.
2. Discover the speed with which the pebble strikes the ground when the pebble is fired vertically straight up.