During an ice hockey game, the away-team goalie notices that the crowd is doing the wave. He estimates that every 10 seconds, the wave of the crowd goes from behind him (0 m away from that edge of the ice) around the opposite edge of the ice 61 m away and back behind him. Explain what the amplitude, period and equation of the axis would represent in a sinusoidal model of the wave moving away from and back to the ice edge behind the goalie in terms of time.