Consider the following two statements:
A. Linear momentum of a system of partcles is zero.
B. Kinetic energ of a system of particles is zero.
A. 1 implies 2 and 2 implies 1
B. 1 does not imply 2 and 2 does not imply 1
C. 1 implies 2 but 2 does not imply 1
D. 1 does not imply 2 but 2 implies 1