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12. A projectile of mass M at the apex of its night explodes into three below. fragments whose mass and velocity are shown in the illustration (A) 20, (BI (C) w / W /x - 15 (D) What was the velocity of the projectile just before it exploded? 13. Rank the four blocks shown below for their change in momentum from the largest change to the smallest change. Each block is in motior for 10.0 s. 1 - 2 ovs -2 m/'s 100 N SON 10 kg 20 kg B ION IO N (A) D > A > C > B (B ) A > D > C > B (C) A > B > D > C kalms ( D ) D > A > B > C 50 N 100 N 10 kg 20 kg C D