A 2 kg ball of clay travelling west at 10 m/s collides with 1 kg ball of clay travelling north at 5 m/s. What is speed of the resulting ball of clay? Suppose that the collision is perfectly inelastic. 

Question2

Two identical, flat, circular coils of wire each have 100 turns and radius R = 0.500 m. The coils are in order as a set of Helmholtz coils so that separation distance between the coils is equal to the radius of coils. Each coils carries current I = 10.0 A. conclude the magnitude of the magnetic field at a point on the common axis of the coils and halfway between them.