The box below has a mass of 75 g and is placed against a spring with a spring constant of 37.4 N/m. The box is then pushed into the spring until the spring has been compressed 78 mm. The box is held at rest for a few seconds and then released so that all the stored energy in the spring is converted into kinetic energy for the box.

After leaving the spring the box encounters a surface with a coefficient of friction of 0.40. How far will the block travel before all the kinetic energy of the block has been converted to heat by this friction