Physics

Problem

A pebble is dropped from rest from the top of a

45\,\text{m}

high well. Take

g = 10\,\text{m/s}^2

. What is the speed of the pebble just before it reaches the water surface? a)

20\,\text{m/s}

30\,\text{m/s}

25\,\text{m/s}

45\,\text{m/s}