A student standing on a cliff throws a rock from a vertical height of d=8.0m above the level ground with velocity v0=17m/s at an angle θ=21∘ below the horizontal, as shown. (See attached photo.) It moves without air resistance. Use a Cartesian coordinate system with the origin at the initial position of the rock. With what speed, in meters per second, does the stone strike the ground?

A student standing on a cliff throws a rock from a vertical height of d=8.0m above the level ground with velocity v0=17m/s at an angle θ=21∘ below the horizontal, as shown. (See attached photo.) It moves without air resistance. Use a Cartesian coordinate system with the origin at the initial position of the rock. With what speed, in meters per second, does the stone strike the ground?

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