a.) Two balls make up a closed system. Ball A has315 J of energy and ball B has7

Question

a.) Two balls make up a closed system. Ball A has315 J of energy and ball B has767 J. After they collide, ball A has605 J. How much energy does ball Bhave after they collide?
1 J

b.) An asteroid and a comet collide head on. Priorto the collision, the asteroid has a momentum of 100,000 kg·m/s right and the comet has a momentum of200,000 kg·m/sleft. After thecollision the asteroid has a momentum of 800,000 kg·m/s right. After the collision, what is thecomet's momentum?
2 kg·m/s

3 North South    East WestUp DownLeft RightNo direction because the comet hasstopped 3

Explanation / Answer

(a) According conservation of kinetic energy we have                   KE1i + KE2i + KE1f + KE2f                 ==> KE2f = 315 J + 767 J - 605J = 477J (b) According to conservation of momentum we have             P1i + P2i = P1f + P2f             ==> P2f = 100000 + 200000 -800000                             = - 500000 kg m /s

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