Cailin

In frozen Minnesota the winter sports carnival includes some unusual events. Since it is dangerous to run on ice, each runner runs on a heavy (240 kg) and long (40 m) wooden plank, which itself rests on the smooth and horizontal ice. One of the competitor...

A particle of mass m is restricted to move without friction on the x-axis. This particle is connected to a fixed point P a distance d from the x-axis by a spring with constant k and length at rest l_0. Working in the two-dimensional plane (x, y), we will...

To Anonymous: l_0 is the length at rest.