anonymous
  • anonymous
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______
Mathematics
schrodinger
  • schrodinger
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asnaseer
  • asnaseer
use conservation of momentum
anonymous
  • anonymous
(a) AB/(A+C) (b) (A+C)/(B+C) (C) AC/(B+C) (D) (A+B)/AC
asnaseer
  • asnaseer
what is the momentum before the collision?

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asnaseer
  • asnaseer
do you know how to calculate momentum?
anonymous
  • anonymous
AB
asnaseer
  • asnaseer
correct - now what is the momentum after the collision - call the velocity of the system after the collision V
anonymous
  • anonymous
yep
anonymous
  • anonymous
V(A+C)
asnaseer
  • asnaseer
correct - now just equate the two and solve for V
anonymous
  • anonymous
right again
asnaseer
  • asnaseer
momentum before collision = momentum after collision
anonymous
  • anonymous
Thanks a lot
asnaseer
  • asnaseer
yw

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