# Physics

'An air rifle pellet of mass 2g is fired into a block of plasticine mounted on a model railway truck. the truck and plasticine have a mass of .1kg. The truck moves off after the pellet hits the plasticine with an initial velocity of .8m/s. calculate the momentum of the plasticine and truck after the collision. Hence work out the velocity of the pellet just before it hits the plasticine.'

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