Physics

Problem

A pebble is released from rest from a bridge and falls for

3\,\text{s}

before hitting the water below. Take

g=9.8\,\text{m/s}^2

. What is its speed just before it touches the water? a)

19.6\,\text{m/s}

44.1\,\text{m/s}

29.4\,\text{m/s}

14.7\,\text{m/s}