As shown below, a 0.40-kilogram mass is sliding on a horizontal, frictionless air track with a speed of 2.0 meters per second when it instantaneously hits and sticks to a 1.6-kilogram mass initially at the rest on the track. The 1.6-kilogram mass is connected to one end of a massless spring, which has a spring constant of 50 newtons per meter. The other end of the spring is fixed.

Before collision (0.4kg; y=2m/s) (1.6kg; k=50N/m)
Right after collision (0.4 kg; 1.6kg; k=50N/m)

After the collision, the two masses undergo simple harmonic motion about their position at impact.

1) Determine the amplitude of the harmonic motion in meters:
2) Determine period of the harmonic motion in seconds: