# Physics...not sure what formula to use

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A 2.0kg bag is held by a string to the ceiling. A 10g bullet travelling at 200m/s strikes the stationary bag. The height of the bag after the collision is 10cm, assuming there is no friction, determine the speed, in m/s, of the bag after the collision.

• Physics...not sure what formula to use -

mb = mass of bullet
vb = velocity of bullet
ma = mass of bag
vab = velocity of bag and bullet
from conservation of momentum:
mb*vb = (ma + mb)*vab
then from conservation of energy:
(ma + mb)*vab^2/2 = (ma + mb)*g*h

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