Physics

Problem

A coin of mass

0.1\,\text{kg}

is dropped from rest from a height of

25\,\text{m}

. At a certain instant, its gravitational potential energy has decreased by

15\,\text{J}

. Neglecting air resistance, what is the speed of the coin at that instant? (Take

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

.) a)

15.0\,\text{m/s}

22.1\,\text{m/s}

17.3\,\text{m/s}

12.0\,\text{m/s}