A man stands at the edge of a cliff and throws a pebble horizontally over the edge with a speed ofv₀=21.0m/s.

The pebble leaves his hand at a height ofh=55.0m

above level ground at the bottom of the cliff, as shown in the figure. Note the coordinate system in the figure, where the origin is at the bottom of the cliff, directly below where the pebble leaves the hand.

A man stands on the edge of a cliff with his hand a heighthabove a flat stretch of ground below the clifftop. The+x-axisextends to the right along the ground and the+y-axisextends up from the ground to the top of the cliff. The originOof the coordinate plane is directly below the man's hand where the base of the cliff meets the flat ground. The man throws a pebble horizontally rightward with initial velocityvectorv₀.The pebble falls with a parabolic trajectory, hitting the ground with a velocityvectorvthat points down and right.Vectorgpoints straight down.