Two blocks slide toward each other along a horizontal surface of negligible friction and collide head-on. The masses and the velocities of the blocks prior to the collision are shown above. During the collision, the impulse on the block of mass 6M has magnitude J . The impulse on the block of mass 4M during the collision has magnitude?
a) 2j/3
b) 3j/4
c) j
d) 4j/3
e) 3j/2