Two object A and B of velocities v1 and v2 have momenta with equal magnitude. If |v1| < |v2|, which of the following is true?
A) The two objects have equal kinetic energies
B) The two objects have equal masses
C) The kinetic energy of A is greater than the kinetic energy of B
D) The kinetic energy of B is greater than the kinetic energy of A
E) Mass of object A is greater than mass of object B

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants