A rock slides horizontally off a cliff that is above level ground and lands from the…

PHYSICS · Single correct · CBSE · Physics · Motion in a Plane · Motion in a Plane

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}

(b)

30\,\text{m/s}

(c)

15\,\text{m/s}

(d)

22\,\text{m/s}