(Solved): Two friends, Burt and Ernie, are standing at opposite ends of a uniform log that is floating in a l ...

Two friends, Burt and Ernie, are standing at opposite ends of a uniform log that is floating in a lake. The log is

long and has mass

. Burt has mass

and Ernie has mass

. Initially the log and the two friends are at rest relative to the shore. Burt then offers Ernie a cookie, and Ernie walks to Burt's end of the log to get it. Part A Relative to the shore, what distance has the log moved by the time Ernie reaches Burt? Neglect any horizontal force that the water exerts on the log and assume that neither Burt nor Ernie falls off the log. Express your answer with the appropriate units.