A rock is dropped from rest from the edge of a -tall cliff

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Kinematics · Kinematics

Problem

A rock is dropped from rest from the edge of a

45\,\text{m}

-tall cliff. Ignore air resistance. Approximately how long does it take the rock to reach the ground? (a)

4.5\,\text{s}

(b)

2.1\,\text{s}

(c)

3.0\,\text{s}

(d)

9.1\,\text{s}