Jose runs 5 laps around the 400 meter track. He ran the first three laps in ten minutes and the last two laps in twenty minutes, His average speed is m/s answer bank: 2,000.0 1.1 3.3 80.0 0.9

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?