Problem 93.
A car of mass 4 m holds a block of mass m which is attached to
the former by means of a spring of spring constant k , as shown in the
diagram. All surfaces are frictionless and the wheels are massless. The
system is at rest. A bullet of mass m is fired at the first block with a
horizontal velocity v 0 and sticks to it. Find:
(a) the velocity of the car at the moment when the spring undergoes
maximum compression.
(b) the maximum compression of the spring.