Physics

Problem

A rock slides horizontally off a cliff that is

45\,\text{m}

above level ground and lands

90\,\text{m}

from the base of the cliff. Neglect air resistance. What was the rock’s horizontal speed as it left the cliff? a)

42\,\text{m/s}

30\,\text{m/s}

15\,\text{m/s}

22\,\text{m/s}