The system shown below consists of two rigid rods AB and BC. Rod CB is connected to AB with a hinge and the rod AB is connected to a ground support with a hinge at A.
Rod 1 has mass m1 and length l1 and Rod 2 has mass m2 and length l2.
a) Derive an expression for the linear momentum of the system. Give its components in a basis of your choice.
b) Derive an expression for the angular momentum of the system about the point A.