試題詳解

5. Bullets from two guns are fired with the same velocity. The bullet from gun #1 is twice as heavy as the bullet from gun #2, and gun #1 weighs three times as much as gun #2. The ratio of the momentum imparted to gun #1 to that imparted to gun #2 is:
(A) 2:3
(B) 3:2
(C) 3:1
(D) 2:1
(E) 6:1.