abdul_shabeer
A bullet of mass A and velocity B is fired into a block of wood of mass C. If loss of any mass and friction be neglected, the velocity of the system must be______
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asnaseer
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use conservation of momentum
abdul_shabeer
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(a) AB/(A+C)
(b) (A+C)/(B+C)
(C) AC/(B+C)
(D) (A+B)/AC
asnaseer
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what is the momentum before the collision?
asnaseer
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do you know how to calculate momentum?
abdul_shabeer
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AB
asnaseer
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correct - now what is the momentum after the collision - call the velocity of the system after the collision V
jimmyrep
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yep
abdul_shabeer
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V(A+C)
asnaseer
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correct - now just equate the two and solve for V
jimmyrep
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right again
asnaseer
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momentum before collision = momentum after collision
abdul_shabeer
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Thanks a lot
asnaseer
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yw