block 1 of mass m1 slides along
an x axis on a frictionless floor at
speed 4.00 m/s. Then it undergoes a
one-dimensional elastic collision
with stationary block 2 of mass m2 =

2.00m1. Next, block 2 undergoes a one-dimensional elastic collision
with stationary block 3 of mass m3 =
2.00m2. (a) What then is the
speed of block 3? (b) Is the kinetic energy, and the momentum of block 3 greater than, less than, or the same as
the initial values for block 1?