Question

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______

Answer 1

use conservation of momentum

Answer 2

(a) AB/(A+C)
(b) (A+C)/(B+C)
(C) AC/(B+C)
(D) (A+B)/AC

Answer 3

what is the momentum before the collision?

Answer 4

do you know how to calculate momentum?

Answer 5

AB

Answer 6

correct - now what is the momentum after the collision - call the velocity of the system after the collision V

Answer 7

yep

Answer 8

V(A+C)

Answer 9

correct - now just equate the two and solve for V

Answer 10

right again

Answer 11

momentum before collision = momentum after collision

Answer 12

Thanks a lot

Answer 13

yw