(a)[1]
State the word equation that gives the definition of momentum.
(b(i))[2]
Calculate the momentum of A before the collision.
(b(ii))[3]
Calculate the velocity $v$ of B after the collision.
(c)[2]
Calculate the average force that acts on B during the collision.
(d)[1]
After the collision in part (b), the combined kinetic energy of the two blocks is smaller than the kinetic energy of block A before the collision. Suggest one reason for this.