2 An air rifle pellet of mass 2 g is fired into a block of modelling clay mounted
on a model railway truck. The truck and modelling clay have a mass of
0.1 kg. The truck moves off after the pellet hits the modelling clay with an
initial velocity of 0.8 m/s.

State the momentum of the pellet just before it hits the modelling clay.
c Use your answers to a and b to calculate the velocity of the pellet just
before it hits the modelling clay.


d State any assumptions you made in this calculation.