Arocket is launched straight with a velocity of 50 m/s. it slows down, reverses direction, and returns to earth . what is the rockets velocity at its highest point above the ground? a. 8.0 m/s b. 0 m/s c.50 m/s d. -6.3m/s e. -8.0 m/s

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